Free NEET Chemistry multiple-choice questions on Aliphatic Amines. Attempt each question and reveal the answer with a full explanation.
The reaction of C 6H 5NH 2 with CHCl 3 and alcoholic KOH produces an offensive smell. This reaction is known as: Carbylamine reaction Hofmann bromamide reaction Gattermann reaction Sandmeyer reaction Nitrogen atom in amines is sp 3 hybridized, but the bond angle is less than 109.5 . This is because of: Lone pair - bond pair repulsion Bond pair - bond pair repulsion Lone pair - lone pair repulsion Electronegativity of Nitrogen Reduction of CH 3CH 2NC with Na/C 2H 5OH gives: CH 3CH 2NHCH 3 CH 3CH 2CH 2NH 2 CH 3CH 2NH 2 (CH 3CH 2) 2NH Which of the following compounds will dissolve in alkali after reaction with Benzenesulphonyl chloride? CH 3CH 2NH 2 (CH 3CH 2) 2NH (CH 3CH 2) 3N C 6H 5N(CH 3) 2 The decreasing order of basicity of the following is: (I) CH 3NH 2 , (II) (CH 3) 2NH , (III) C 6H 5NH 2 , (IV) NH 3 II > I > IV > III I > II > III > IV II > I > III > IV IV > III > II > I Which of the following cannot be prepared by Gabriel phthalimide synthesis? Aniline Methylamine Ethylamine Isopropylamine Electrolytic reduction of nitrobenzene in weakly acidic medium gives :- Aniline p-Hydroxy aniline N-Phenyl hydroxyl amine Nitroso benzene Aniline in a set of reactions yielded a product D The structure of the product D would be - C6H5CH2OH C6H5CH2NH2 C6H5NHOH C6H5NHCH2CH3 Which one of the following on reduction with lithium aluminium hydride yields a secondary amine? Methyl isocyanide Acetamide Methyl cyanide Nitroethane. Predict the product : The correct order of the basic strength of methyl substituted amines in aqueous solution is : CH3NH2 > (CH3)2NH > (CH3)3N (CH3)2NH > CH3NH2 > (CH3)3N (CH3)3N > CH3NH2 > (CH3)2NH (CH3)3N > (CH3)2NH > CH3NH2 Identify the compound that will react with Hinsberg's reagent to give a solid which dissolves in alkali. Primary, secondary and tertiary amines can be separated by fractional distillation if: Their boiling points are sufficiently different They form azeotropes They are all liquids They are treated with KOH Match List-I with List-II. array ll List-I & List-II (Drug class) & (Drug molecule) (a) Antacids & (i) Salvarsan (b) Antihistamines & (ii) Morphine (c) Analgesics & (iii) Cimetidine (d) Antimicrobials & (iv) Seldane array Choose the correct answer from the options given below : (a) - (iii), (b) - (iv), (c) - (ii), (d) - (i) (a) - (i), (b) - (iv), (c) - (ii), (d) - (iii) (a) - (iv), (b) - (iii), (c) - (i), (d) - (ii) (a) - (iii), (b) - (ii), (c) - (iv), (d) - (i) Which of the following reactions will NOT give primary amine as the product? CH3CONH2 [ KOH ] Br2 Product CH3CN [(ii) H3O+ ] (i) LiAlH4 Product CH3NC [(ii) H3O+ ] (i) LiAlH4 Product CH3CONH2 [(ii) H3O+ ] (i) LiAlH4 Product Identify the major product C formed in the following reaction sequence: CH3-CH2-CH2-I NaCN A [ Partial hydrolysis ] OH - B NaOH / Br2 C (major) propylamine butylamine butanamide –bromobutanoic acid Select the reagents that reduce nitriles to primary amines. A. (i) LiAlH4 ; (ii) H2O B. Sn + HCl C. H2/Ni D. Na(Hg)/C2H5OH E. Br2/aq. NaOH Choose the correct answer from the options given below. A, B and C only A, D and E only A, C and D only B, D and E only The major product Z formed in the following sequence of reactions is C2H6 ->[Cl2][UV light] X (monochlorinated product) ->[NH3] Y ->[(i) NaNO2/HCl][(ii) H2O] Z C2H5-N=N-OH C2H5OH C2H5NO2 C2H5NH2 Which of the following amines gives the Libermann Nitroso reaction? N -methylaniline Aniline N,N -dimethylaniline Ethylamine A compound 'X' on treatment with Br 2/NaOH gives 'Y'. 'Y' reacts with HNO 2 to form benzyl alcohol. Identify 'X'. C 6H 5CH 2CONH 2 C 6H 5CONH 2 C 6H 5CH 2NH 2 C 6H 5NH 2 The structural formula of the compound formed by the reaction of Ethylamine with Phosgene ( COCl 2 ) is: CH 3CH 2NCO (CH 3CH 2NH) 2CO CH 3CH 2Cl CH 3CH 2NHCOCl Identify the product 'Z' in the sequence: CH 3CN Na/C 2H 5OH X HNO 2 Y KMnO 4/H + Z Acetic acid Ethanol Ethanamine Ethyl nitrite The correct order of basicity of the following compounds: (I) Guanidine, (II) Ethylamine, (III) Aniline, (IV) Dimethylamine, in aqueous medium is: (I) > (IV) > (II) > (III) (I) > (II) > (IV) > (III) (IV) > (I) > (II) > (III) (II) > (IV) > (I) > (III) Which of the following is most soluble in water? Ethylamine Diethylamine Triethylamine Aniline The conversion of an amide to a primary amine with one fewer carbon atom using Br 2 and KOH is known as the Hofmann bromamide degradation. The rate-determining step in this reaction is: Migration of the alkyl/aryl group from carbonyl carbon to nitrogen Formation of the N-bromoamide Formation of the isocyanate Hydrolysis of the isocyanate The correct order of boiling points for the following compounds: (I) n-butylamine , (II) diethylamine , (III) n-butane , (IV) n-butyl alcohol is: (IV) > (I) > (II) > (III) (I) > (II) > (IV) > (III) (IV) > (II) > (I) > (III) (III) > (II) > (I) > (IV) Hofmann's method for the separation of a mixture of 1 , 2 , and 3 amines involves the use of which reagent? Diethyl oxalate Benzene sulphonyl chloride Acetyl chloride Nitrous acid Which of the following describes the 'Steric Inhibition of Protonation' (SIP) observed in N,N -dimethyl-o-toluidine? The bulky groups at ortho position prevent the lone pair from being in plane, increasing basicity. The bulky groups prevent the approach of a proton, decreasing basicity. The methyl group increases electron density via the +I effect, increasing basicity. The groups cause the molecule to become planar, decreasing basicity. Nitrosation of tertiary aliphatic amines ( R 3N ) with NaNO 2/HCl at low temperature typically results in: Soluble nitrite salts Insoluble yellow oils Evolution of N 2 gas Formation of alcohols The reaction of ethylamine with Nitrosyl chloride ( NOCl , Tilden's reagent) yields: Ethyl chloride Nitroethane Ethanol Ethyl nitrite The reaction of hydroxamic acids ( R-CONHOH ) with benzene sulphonyl chloride in the presence of a base to form amines is known as: Lossen rearrangement Schmidt reaction Gabriel synthesis Hofmann rearrangement The correct order of basicity for the following amines in a non-polar solvent like chlorobenzene is: (CH 3) 3N > (CH 3) 2NH > CH 3NH 2 > NH 3 (CH 3) 2NH > CH 3NH 2 > (CH 3) 3N > NH 3 (CH 3) 2NH > (CH 3) 3N > CH 3NH 2 > NH 3 NH 3 > CH 3NH 2 > (CH 3) 2NH > (CH 3) 3N Reaction of 1 amines with phthalic anhydride followed by heating produces: N -alkylphthalimide Phthalic acid Phthalimide Alkyl cyanide The major product of the reaction between n -butylamine and excess methyl iodide followed by heating with moist Ag 2O is: But-1-ene But-2-ene Butan-1-ol Butan-2-ol When N,N -Dimethylaniline reacts with benzenesulphonyl chloride, the result is: No reaction Formation of a sulphonamide soluble in NaOH Formation of a sulphonamide insoluble in NaOH Formation of a quaternary ammonium salt Nitrolic acid, which gives a red color with NaOH , is formed by the reaction of HNO 2 with: Nitroethane 2-Nitropropane 2-Methyl-2-nitropropane Nitromethane Which reagent is used to distinguish between nitroethane and ethyl nitrite? Aqueous KOH LiAlH4 Fe/HCl Bromine water The infrared (IR) spectrum of a primary amine shows two characteristic absorption bands in the range of 3300-3500 cm -1 . These bands are due to: Symmetric and asymmetric N-H stretching N-H bending and C-N stretching N-H stretching and C-H stretching Overtones of C-N vibration Identify the correct statement about the basicity of Guanidine. It is a very strong base due to the resonance stabilization of its conjugate acid. It is a weak base because the lone pair is involved in resonance. It is less basic than methylamine. It does not show basic properties because of three nitrogen atoms. Which of the following quaternary ammonium hydroxides will undergo Hofmann elimination to produce ethylene as the major product upon heating? (C 2H 5) 4N +OH - (CH 3) 4N +OH - (CH 3) 3N +(CH 2CH 2CH 3)OH - (CH 3) 3N +(CH 2C 6H 5)OH - Guanidine is an exceptionally strong base (comparable to NaOH ) because: Its conjugate acid is highly stabilized by resonance involving three equivalent structures. It has three nitrogen atoms. The Nitrogen atoms are sp 3 hybridized. It has a very high molecular weight. Arrange the following in increasing order of basicity: (I) Morpholine, (II) Piperidine, (III) Pyridine. (III) < (I) < (II) (I) < (III) < (II) (II) < (I) < (III) (III) < (II) < (I) Reaction of a tertiary aliphatic amine with hydrogen peroxide ( H 2O 2 ) or peracids yields: Amine oxide Nitro compound Hydroxylamine Nitrite What is the product formed when a secondary amine reacts with diethyl oxalate in Hofmann's method for the separation of amines? Dialkyl oxamic ester Dialkyl oxamide Trialkyl amine salt No reaction What is the product of the reaction between methylamine and carbon dioxide at high pressure? Methylammonium methylcarbamate Methyl urea Dimethyl carbonate Methyl isocyanate When methylamine is treated with an excess of methyl iodide in the presence of a base, the final product is: Tetramethylammonium iodide Trimethylamine Dimethylamine Methylammonium iodide The reaction of a primary amine with carbon disulphide ( CS 2 ) in the absence of HgCl 2 yields: Alkyldithiocarbamic acid Alkyl isothiocyanate Dialkyl thiourea Alkyl isocyanide The product (P) of the following reaction The pK b value of ammonia is 4.75, while that of methylamine is 3.38. This indicates that: Methylamine is a stronger base than ammonia Ammonia is a stronger base than methylamine Both are equally basic Methylamine is more acidic than ammonia The solubility of lower aliphatic amines in water is due to: Formation of hydrogen bonds with water molecules Their non-polar nature Their high molecular weight Formation of coordinate bonds with water What is the physical state of methanamine and ethanamine at room temperature? Gases Liquids Solids Vapors Which functional group is identified by the reaction with CHCl 3 and alc. KOH ? Aliphatic and aromatic primary amines Secondary amines only Tertiary amines only Nitro groups Which of the following compounds reacts with NaNO 2 and HCl to form a 'Nitrosamine' which is a yellow oily liquid? (CH 3) 2NH CH 3NH 2 (CH 3) 3N C 6H 5NH 2 Methylamine reacts with HNO 2 to liberate: N 2 gas O 2 gas H 2 gas NH 3 gas The reaction of an alkyl halide with ammonia gives a mixture of 1 , 2 , 3 amines and quaternary ammonium salt. To get a primary amine as the major product, one should use: Large excess of ammonia Large excess of alkyl halide Equal amounts of both A catalyst like CuCl Which of the following alkyl halides is most reactive in the Gabriel Phthalimide synthesis? CH 3I CH 3CH 2Br (CH 3) 2CHCl (CH 3) 3CCl Identify the optically active amine among the following isomers of C 4H 11 N : Butan-2-amine Butan-1-amine 2 -Methylpropan-1-amine 2 -Methylpropan-2-amine The correct order of boiling points for the isomers of C 4H 11 N is: Primary > Secondary > Tertiary Tertiary > Secondary > Primary Secondary > Primary > Tertiary All have the same boiling point Which of the following compounds will give a positive Carbylamine test? p -Toluidine N,N -Dimethylaniline N -Methylaniline Diphenylamine Which amine will NOT react with Hinsberg reagent? Triethylamine Ethylamine Diethylamine Aniline The pK b values of four amines are given. Which one represents the strongest base? 3.00 4.75 9.30 10.50 Which of the following will not undergo the Carbylamine reaction? N -Methylaniline Ethylamine Aniline p-Toluidine The reagent 'Hinsberg's reagent' is chemically: C 6H 5SO 2Cl C 6H 5COCl SOCl 2 ClSO 3H Which of the following amines is a liquid at room temperature and has a distinct 'fishy' odor? Trimethylamine Methanamine Ethanamine Ammonia The reduction of alkyl cyanides with sodium and ethanol to give primary amines is known as: Mendius reaction Stephen's reduction Hofmann's reaction Clemmensen reduction The H-N-H bond angle in methylamine is approximately: 107 109.5 120 180 Which of the following cannot be used as a reagent to distinguish between CH 3NH 2 and (CH 3) 2NH ? NaOH Hinsberg reagent HNO 2 CHCl 3/KOH The compound which on reaction with aqueous KOH and CHCl 3 gives a product with very bad smell is: C 6H 5NH 2 C 6H 5NHCH 3 C 6H 5N(CH 3) 2 C 6H 5CH 2NHCH 3 What is the hybridization of Nitrogen in Trimethylamine? sp 3 sp 2 sp Direct p-orbital Acetamide is less basic than methylamine because: The lone pair on Nitrogen is delocalized to the Oxygen atom via resonance. The carbonyl group has a strong +I effect. Nitrogen in acetamide is sp 2 hybridized. Acetamide is a planar molecule. Which of the following is more basic than aniline:- Diphenylamine Triphenylamine p-Nitroaniline Benzylamine The correct statement regarding the basicity of arylamines is :- Arylamines are generally less basic than alkylamines because the nitrogen lone-pair electrons are delocalized by interaction with the aromatic ring electron system. Arylamines are generally more basic than alkylamines because the nitrogen lone-pair electrons are not delocalized by interaction with the aromatic ring electron system. Arylamines are generally more basic than alkylamines because of aryl group. Arylamines are generally more basic than alkylamines, because the nitrogen atom in arylamines is sp-hybridized. Nitration of aniline in strong acidic medium also gives m-nitroaniline because In absence of substituents nitro group always goes to m-position. In electrophilic substitution reactions amino group is meta directive. Inspite of substituents nitro group always goes to only m-position. In acidic (strong) medium aniline is present as anilinium ion. Which of the following amine will give the carbylamine test? Given below are two statements: Statement I : Aniline does not undergo Friedel-Crafts alkylation reaction. Statement II : Aniline cannot be prepared through Gabriel synthesis. In the light of the above statements, choose the correct answer from the options given below: Both statement I and Statement II are true Both Statement I and Statement II are false Statement I is correct but Statement II is false Statement I is incorrect but Statement II is true The geometry of the trimethylamine molecule is: Pyramidal Tetrahedral Trigonal planar See-saw The correct order of decreasing basic strength of the given amines is: benzenamine > ethanamine > N-methylaniline > N-ethylethanamine N-methylaniline > benzenamine > ethanamine > N-ethylethanamine N-ethylethanamine > ethanamine > benzenamine > N-methylaniline N-ethylethanamine > ethanamine > N-methylaniline > benzenamine Identify the correct order of the basic strength of the following compounds in the aqueous phase: (I) CH 3NH 2 , (II) (CH 3) 2NH , (III) (CH 3) 3N , (IV) NH 3 II > I > III > IV II > III > I > IV I > II > III > IV III > II > I > IV The reaction of primary amines with CS 2 followed by HgCl 2 is called: Hofmann's Mustard Oil reaction Carbylamine reaction Libermann's reaction Schotten-Baumann reaction Which of the following amines will give a clear solution on reaction with benzenesulphonyl chloride followed by addition of excess NaOH ? Primary amine Secondary amine Tertiary amine None of these Which of the following has the lowest pK b value? (C 2H 5) 2NH C 2H 5NH 2 (C 2H 5) 3N (CH 3) 3N The 'Umbrella Inversion' or 'Amine Inversion' is not possible in: Quaternary ammonium salts Trimethylamine Methylamine Dimethylamine Which of the following compounds will give the Victor Meyer test for 1 nitroalkanes (Red color)? CH 3CH 2NO 2 (CH 3) 2CHNO 2 (CH 3) 3CNO 2 C 6H 5NO 2 Which of the following isomer of C 3H 9N has the lowest boiling point? Trimethylamine n-Propylamine Isopropylamine Ethylmethylamine Identify the compound that exhibits tautomerism among the following: CH 3CH 2NO 2 (CH 3) 3CNO 2 C 6H 5NO 2 CH 3ONO Which of the following amines is most basic in the gas phase? (C 2H 5) 3N (C 2H 5) 2NH C 2H 5NH 2 NH 3 The gas evolved when methylamine reacts with nitrous acid is: N 2 O 2 H 2 CO 2 The structural formula of 'Mustard Oil' (Ethyl isothiocyanate) is formed when ethylamine reacts with: CS 2 and HgCl 2 COCl 2 CHCl 3 and KOH CH 3COCl Which of the following reactions is used for the preparation of secondary amines? Reduction of alkyl isocyanides Reduction of alkyl cyanides Hofmann bromamide reaction Gabriel phthalimide synthesis The Hinsberg's reagent (Benzenesulphonyl chloride) reacts with a compound to form a product that is insoluble in NaOH but soluble in HCl . The compound is likely a: Secondary amine Primary amine Tertiary amine Quaternary ammonium salt Which alkene is the major product when N,N,N -trimethylethanaminium hydroxide is heated? Ethene Propene But-1-ene But-2-ene Arrange the following in increasing order of basicity: (I) Pyridine, (II) Piperidine, (III) Pyrrole. III < I < II I < II < III II < I < III III < II < I Identify the correct order of boiling points for the following isomers of C 3H 9N : (I) n -propylamine, (II) Isopropylamine, (III) Trimethylamine. I > II > III III > II > I II > I > III I > III > II For the reduction of nitrobenzene to aniline, Fe/HCl is preferred over Sn/HCl because: FeCl 2 formed gets hydrolyzed to release HCl , requiring only a small amount of initiator acid. Fe/HCl is a stronger reducing agent. Fe/HCl does not reduce the benzene ring. Sn/HCl produces toxic byproducts. The correct order of basic strength of ethyl substituted amines in the aqueous phase is: (C 2H 5) 2NH > (C 2H 5) 3N > C 2H 5NH 2 > NH 3 (C 2H 5) 3N > (C 2H 5) 2NH > C 2H 5NH 2 > NH 3 (C 2H 5) 2NH > C 2H 5NH 2 > (C 2H 5) 3N > NH 3 (C 2H 5) 3N > C 2H 5NH 2 > (C 2H 5) 2NH > NH 3 In Hofmann's method for separating a mixture of amines, the reagent diethyl oxalate reacts with a primary amine to form: A solid oxamide A liquid oxamic ester A gaseous alkane No reaction Arrange the following in increasing order of boiling point: (I) CH 3CH 2NH 2 , (II) (CH 3) 2NH , (III) CH 3CH 2OH . II < I < III I < II < III III < II < I II < III < I Methylamine reacts with acetyl chloride to give: N-Methylacetamide N,N-Dimethylacetamide Acetamide Methyl acetate The reaction of Ethylamine with phosgene ( COCl 2 ) gives: Ethyl isocyanate Ethyl carbamate Diethyl urea Ethyl chloride The energy barrier required for the 'Umbrella Inversion' (amine inversion) in simple aliphatic tertiary amines is approximately: 25 kJ mol -1 100 kJ mol -1 5 kJ mol -1 250 kJ mol -1 In the Hofmann bromamide degradation reaction, the number of moles of NaOH and Br 2 used per mole of amine produced are respectively: 4 and 1 2 and 1 4 and 2 1 and 4 Which of the following amines is the strongest base in an aqueous solution? (C 2H 5) 2NH (C 2H 5) 3N C 2H 5NH 2 NH 3 The Van Slyke method for the quantitative estimation of nitrogen involves the reaction of primary aliphatic amines with: HNO 2 HNO 3 HCl NaOH The reaction of an amide with P 4O 10 (or P 2O 5 ) on heating yields: Alkyl cyanide Alkyl amine Alkyl isocyanide Carboxylic acid The boiling points of 1 , 2 , and 3 amines of isomeric molecular formulas follow the order: 1 > 2 > 3 3 > 2 > 1 2 > 1 > 3 1 > 3 > 2 In the Gabriel phthalimide synthesis, which of the following cannot be used as the alkylating agent? Chlorobenzene Methyl iodide Ethyl bromide Benzyl chloride Methyl isocyanide on reduction with LiAlH 4 gives: Dimethylamine Ethylamine Methylamine Trimethylamine What is the C-N-C bond angle in trimethylamine (CH 3) 3N ? 108 109.5 107 120 The reagent used to distinguish between primary, secondary, and tertiary amines is: Benzenesulphonyl chloride CH 3MgBr K 2Cr 2O 7/H + Acetyl chloride The reaction of an amine with a Grignard reagent ( R'MgX ) produces: Alkane Alcohol Secondary amine Tertiary amine Reaction of n -butylamine with NaNO 2 and HCl at room temperature gives a mixture of products. The major organic product is: n -Butanol and but-1-ene Chlorobutane n -Butyl nitrite Nitrobutane The increasing order of basicity for the following in the gas phase is: (I) NH 3 , (II) CH 3NH 2 , (III) (CH 3) 2NH , (IV) (CH 3) 3N (I) < (II) < (III) < (IV) (IV) < (III) < (II) < (I) (I) < (IV) < (II) < (III) (I) < (II) < (IV) < (III) Which of the following reacts with Hinsberg's reagent to give a product that is insoluble in both NaOH and HCl ? Diethylamine Ethylamine Triethylamine Aniline Which of the following is most basic in aqueous solution? (C 2H 5) 2NH (C 2H 5) 3N C 2H 5NH 2 NH 3 The reaction of a primary amine with an epoxide (ethylene oxide) produces: 2-Aminoethanol 1-Aminoethanol Ethylenediamine Ethylene glycol What is the product of the reaction between methylamine and one mole of ethylene oxide? CH 3NHCH 2CH 2OH (CH 3) 2NCH 2CH 2OH CH 3N(CH 2CH 2OH) 2 CH 3NHCH 2CH 3 What happens when alkyl isocyanide is heated at 250 C ? It rearranges to form alkyl cyanide. It decomposes to give an alkene and HCN . It polymerizes to form a resin. It reacts with moisture to form an amine. Which of the following methods gives a pure primary amine without any contamination of secondary or tertiary amines? Gabriel Phthalimide synthesis Hofmann's ammonolysis of alkyl halides Reduction of nitroalkanes with LiAlH 4 Reaction of R-MgX with NH 2Cl A compound 'X' with molecular formula C 3H 9N reacts with C 6H 5SO 2Cl to give a solid which is insoluble in alkali. 'X' is: Ethylmethylamine Isopropylamine n -Propylamine Trimethylamine What is the product of the reaction between ethylamine and nitrous acid ( HNO 2 ) at room temperature? C 2H 5OH + N 2 + H 2O C 2H 5NO 2 C 2H 5-N=N-C 2H 5 CH 3CH 2NHNO 2 The reaction of CH 3CH 2NH 2 with CS 2 in the presence of HgCl 2 gives a compound with a characteristic smell of mustard oil. The product is: CH 3CH 2N=C=S CH 3CH 2S-C N (CH 3CH 2NH) 2CS CH 3CH 2N=C=O The basic strength of the following amines in aqueous solution follows the order: (C 2H 5) 2NH > (C 2H 5) 3N > C 2H 5NH 2 (C 2H 5) 3N > (C 2H 5) 2NH > C 2H 5NH 2 C 2H 5NH 2 > (C 2H 5) 2NH > (C 2H 5) 3N (C 2H 5) 2NH > C 2H 5NH 2 > (C 2H 5) 3N Which of the following statements about the boiling points of amines is correct? 1 amines have higher boiling points than 2 amines of the same mass. Tertiary amines have the highest boiling points due to high symmetry. Amines have higher boiling points than alcohols of comparable mass. Aliphatic amines have higher boiling points than aromatic amines. An organic compound 'A' with molecular formula C 2H 7N on reaction with HNO 2 at 0 C gives a clear solution. On heating the solution, a gas is evolved. 'A' is: Ethylamine Dimethylamine Acetamide Methylamine In the separation of a mixture of amines using Hinsberg's reagent, which type of amine forms a product that is soluble in aqueous KOH ? Primary amine Secondary amine Tertiary amine All of these Reduction of nitrobenzene with Tin ( Sn ) and concentrated HCl gives aniline. If the same reaction is carried out with Zn and aqueous NH 4Cl , the product is: Phenylhydroxylamine Nitrosobenzene Hydrazobenzene Azobenzene A compound 'X' reacts with HNO 2 to form a nitroso compound which gives a green color with phenol and conc. H 2SO 4 (Libermann test). 'X' is likely: (C 2H 5) 2NH C 2H 5NH 2 (C 2H 5) 3N C 6H 5NH 2 Which of the following has the shortest C-N bond length? Acetamide Aniline Methylamine Ethylamine Gabriel phthalimide synthesis is NOT suitable for the preparation of aniline because: Aryl halides do not undergo nucleophilic substitution with potassium phthalimide. Aniline is too basic to be formed. Phthalimide does not react with ammonia. The product formed is unstable. Which of the following is true regarding the hydrolysis of alkyl isocyanides ( R-NC )? They are easily hydrolyzed by dilute acids but resistant to alkalis. They are easily hydrolyzed by both acids and alkalis. They are easily hydrolyzed by alkalis but resistant to acids. They are resistant to both acids and alkalis. Aniline reacts with excess of CH 3I in the presence of Na 2CO 3 to form a quaternary ammonium salt. This process is called: Exhaustive methylation Hofmann elimination Mendius reaction Gabriel synthesis Arrange the following in increasing order of basic strength: (I) CH 3CH 2NH 2 , (II) CF 3CH 2NH 2 , (III) CH 3NH 2 . II < III < I II < I < III I < III < II III < I < II The reaction of Urea ( NH 2CONH 2 ) with Sodium hypobromite ( NaOBr ) in the presence of NaOH yields: Hydrazine Ammonia Nitrogen gas Methylamine The molecular geometry of the isocyanide group ( -N C ) in alkyl isocyanides is: Linear Bent Trigonal planar Tetrahedral Primary nitroalkanes react with bromine in the presence of NaOH to give: -Bromo-nitroalkanes -Bromo-nitroalkanes Bromoform Nitrobromomethane The reaction of an aldehyde with a primary amine followed by reduction with NaBH 3CN is called: Reductive amination Gattermann reaction Etard reaction Cannizzaro reaction Which of the following is the most basic in the aqueous phase? (CH 3) 2NH (CH 3) 3N (CH 3)NH 2 (NH 3) What is the correct order of basic strength in the gas phase for the following amines? (C 2H 5) 3N > (C 2H 5) 2NH > C 2H 5NH 2 > NH 3 (C 2H 5) 2NH > (C 2H 5) 3N > C 2H 5NH 2 > NH 3 NH 3 > C 2H 5NH 2 > (C 2H 5) 2NH > (C 2H 5) 3N (C 2H 5) 3N > C 2H 5NH 2 > (C 2H 5) 2NH > NH 3 Secondary amines react with nitrous acid ( HNO 2 ) to form: Yellow oily N-nitrosoamines Alcohol and N 2 gas Nitroalkanes A stable diazonium salt Which of the following is the strongest base? Benzylamine Aniline p-nitroaniline m-nitroaniline When CH 3CONH 2 is treated with LiAlH 4 , the product obtained is: CH 3CH 2NH 2 CH 3NH 2 CH 3CH 2OH CH 3CN