Free NEET Chemistry multiple-choice questions on IUPAC Nomenclature. Attempt each question and reveal the answer with a full explanation.
The correct IUPAC name for the compound CH 3-CO-Cl is: Ethanoyl chloride Acetyl chloride Chloroethanone Methyl carbonyl chloride During the estimation of Halogens by Carius method, the silver salt formed when an organic compound containing chlorine is treated with AgNO 3 is: White precipitate Pale yellow precipitate Yellow precipitate Black precipitate The correct structure of 2, 6-Dimethyl-dec-4-ene is The correct IUPAC name of the following compound is 6-bromo-2-chloro-4-methylhexan-4-ol 1-bromo-4-methyl-5-chlorohexan-3-ol 6-bromo-4-methyl-2-chlorohexan-4-ol 1-bromo-5-chloro-4-methylhexan-3-ol The correct IUPAC name of the following compound is : 3-ethyl-5-methylheptane 3-methyl-5-ethylheptane 2,4-diethylhexane 3,5-diethylhexane The bond between Carbon-1 and Carbon-2 in CH 2=CH-C CH involves hybridization: sp 2 and sp 2 sp 2 and sp sp and sp sp 3 and sp During the estimation of nitrogen by Dumas method, 0.25 g of an organic compound gave 40 mL of nitrogen collected at 300 K and 725 mm pressure. If the aqueous tension at 300 K is 25 mm, the percentage of nitrogen in the compound is: 17.36% 15.76% 18.20% 20.11% The correct IUPAC name for the following bicyclic compound is: [Two fused rings of 4 carbons each sharing 2 carbons, no substituents] Bicyclo[2.2.0]hexane Bicyclo[4.4.0]decane Bicyclo[2.2.2]octane Bicyclo[1.1.0]butane In C 3O 2 (Carbon suboxide), what is the hybridization of the central carbon atom? sp sp 2 sp 3 None of these During the estimation of phosphorus by Carius method, phosphorus is precipitated as: MgNH 4PO 4 Mg 2P 2O 7 H 3PO 4 Ag 3PO 4 The hybridization of the carbon atom in a singlet carbene ( :CH 2 ) is: sp 2 sp sp 3 dsp 2 In the estimation of sulphur by Carius method, 0.468 g of an organic compound gave 0.668 g of barium sulphate ( BaSO 4 ). The percentage of sulphur in the compound is: (Atomic mass: Ba=137, S=32, O=16 ) 19.6 % 25.4 % 15.2 % 32.1 % What is the IUPAC name of the compound: [A cyclohexane ring with a double bond and a methyl group on one of the double-bonded carbons]? 1-methylcyclohexene 2-methylcyclohexene Methylcyclohex-1-ene 1-methylcyclohex-2-ene In the Duma's method for the estimation of nitrogen, 0.3 g of an organic compound gave 50 mL of nitrogen collected at 300 K and 715 mm pressure. If the aqueous tension at 300 K is 15 mm, what is the volume of N 2 at STP? 41.9 mL 46.0 mL 38.5 mL 50.0 mL In a reaction involving a singlet carbene ( :CH 2 ), the hybridization of the carbon atom is: sp 2 sp sp 3 Unhybridized During the estimation of nitrogen by Kjeldahl's method, 0.5 g of an organic compound required 10 mL of 1 M H 2SO 4 for complete neutralization of the ammonia evolved. The percentage of nitrogen in the compound is: 56% 28% 14% 42% Structure of the compound whose IUPAC name is 3-Ethyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid is Arrange the following compounds in the increasing order of polarity A. CH3CH2OCH2CH3 B. CH3CH2OH C. CH3COCH3 D. CH3COOH Choose the correct answer from the options given below. A < B < C < D C < A < D < B C < A < B < D A < C < B < D The correct IUPAC name of the compound CH 3-CO-CH(CH 3) 2 is: 3-methylbutan-2-one 2-methylbutan-3-one Isopropyl methyl ketone 2-formylbutane Which of the following acts as a nucleophile? NH 3 BF 3 AlCl 3 NO 2 + The IUPAC name of the compound CH 2=CH-CH 2-OH is: Prop-2-en-1-ol Allyl alcohol Prop-1-en-3-ol Vinyl carbinol The IUPAC name for CH 3-CH 2-CH(CH 3)-CH(CH 3)-CH 2-CH 3 is: 3,4-dimethylhexane 2,3-diethylbutane 2-ethyl-3-methylpentane Isooctane Which of the following groups has the highest priority in IUPAC nomenclature? -COOH -CHO -OH -COOR Which of the following is the correct IUPAC name for CH 3-CH(OH)-CH 2-CO-CH 3 ? 4-Hydroxypentan-2-one 2-Hydroxypentan-4-one Pentane-2-ol-4-one 4-Oxopentan-2-ol Steam distillation is used for the purification of which of the following substances? Aniline Glycerine Acetone Benzene The correct IUPAC name for CH 3-C C-CH(CH 3) 2 is: 4-Methylpent-2-yne 4,4-Dimethylbut-2-yne Methylisopropylacetylene 2-Methylpent-3-yne The IUPAC name of the compound CH 3-CH=CH-CHO is: But-2-enal But-1-enal Crotonaldehyde Prop-2-enal In the Duma's method for estimation of nitrogen, the gas collected in the nitrometer is: N 2 NH 3 NO 2 NO The reaction CH 3Br + OH - CH 3OH + Br - is an example of: Nucleophilic substitution Electrophilic substitution Nucleophilic addition Electrophilic addition What is the hybridization of oxygen in diethyl ether? sp 3 sp 2 sp dsp 2 Which of the following is the correct IUPAC name for the compound CH 3-CH(OH)-CH 2-CH 2-COOH ? 4-hydroxypentanoic acid 2-hydroxypentanoic acid 4-hydroxypentane-1-oic acid 1-carboxybutan-4-ol Paper chromatography is a type of: Partition chromatography Adsorption chromatography Ion-exchange chromatography Size-exclusion chromatography Identify the correct IUPAC name of the compound: CH 3-C(CH 3) 2-CH=CH 2 3,3-Dimethylbut-1-ene 2,2-Dimethylbut-3-ene 1,1,1-Trimethylprop-2-ene Isohexene The number of electrons in the naphthalene molecule is: 10 8 6 12 Which of the following is an example of an ambident nucleophile? CN - OH - NH 3 H 2O The correct IUPAC name for CH 3-O-CH(CH 3) 2 is: 2-Methoxypropane Isopropyl methyl ether 1-Methoxy-1-methylethane Methyl isopropoxide What is the hybridization of carbon in the carbocation CH 3-CH 2 + ? sp 2 sp 3 sp dsp 2 The IUPAC name for the compound CH 3-CH(NH 2)-CH 3 is: Propan-2-amine Isopropylamine 2-Aminopropane Propan-1-amine The presence of sulfur in an organic compound can be detected by using: Sodium nitroprusside Ferrous sulfate Silver nitrate Benedict's solution What is the correct IUPAC name of the compound CH 3-CH(OH)-CH 2-CHO ? 3-hydroxybutanal 2-hydroxybutanal 3-hydroxybutanone 4-oxobutan-2-ol The hybridization of the central carbon in propadiene ( CH 2=C=CH 2 ) is: sp sp 2 sp 3 dsp 2 The correct IUPAC name for CH 3-CO-O-CO-CH 3 is: Ethanoic anhydride Acetic anhydride Methanoic anhydride Ethane dioate Chromatography is based on the principle of: Differential adsorption or partition Differential boiling points Differential solubilities Differential densities The presence of halogen in an organic compound is detected by Carius method. In this method, the organic compound is heated with nitric acid in the presence of: Silver nitrate Barium chloride Sodium metal Magnesium ribbon During the Lassaigne's test, the organic compound is fused with sodium metal to: Convert covalent bonds to ionic bonds Increase the reactivity of the compound Decrease the melting point Identify the type of carbon chain In the Duma's method for estimation of nitrogen, 0.2 g of an organic compound gave 31 mL of nitrogen collected at 300 K and 715 mm pressure. If aqueous tension at 300 K is 15 mm, what is the pressure of dry nitrogen? 700 mm 715 mm 730 mm 685 mm The reaction CH 2=CH 2 + HBr CH 3-CH 2Br is an example of: Electrophilic addition Nucleophilic addition Electrophilic substitution Free radical substitution What is the correct IUPAC name for the following compound? CH 3-CH(Cl)-CH(Br)-CH 3 2-bromo-3-chlorobutane 3-bromo-2-chlorobutane 2-chloro-3-bromobutane 3-chloro-2-bromobutane The IUPAC name of COOH-COOH is: Ethanedioic acid Oxalic acid Methanedioic acid Ethan-1,2-dioic acid The structural formula of 'isobutyl' group is: (CH 3) 2CH-CH 2- CH 3-CH 2-CH(CH 3)- (CH 3) 3C- CH 3-CH 2-CH 2-CH 2- The IUPAC name of the compound CH 3-C(CH 3)=C(CH 3)-CHO is: 2,3-dimethylbut-2-enal 2,3-dimethylbut-2-en-1-al 1-oxo-2,3-dimethylbut-2-ene 2,3-dimethyl-2-butenone What is the correct IUPAC name for the compound CH 3-CH(Cl)-CH(OH)-CH 3 ? 3-chlorobutan-2-ol 2-chloro-3-hydroxybutane 2-chlorobutan-3-ol 3-hydroxy-2-chlorobane Which technique is most suitable for the purification of a mixture containing two volatile liquids with a boiling point difference of less than 25 K? Fractional distillation Simple distillation Steam distillation Distillation under reduced pressure Which of the following pairs represents functional isomers? Nitroethane and Ethyl nitrite 1-Nitropropane and 2-Nitropropane Nitromethane and Nitroethane Ethane and Ethene What is the IUPAC name of Bicyclo[2.2.1]heptane? Norbornane Adamantane Pinane Camphane Which of the following represents the correct structure of 2,3-dimethylbut-2-ene? (CH 3) 2C=C(CH 3) 2 CH 3-CH(CH 3)-C(CH 3)=CH 2 CH 3-C(CH 3)=CH-CH(CH 3) 2 (CH 3) 2CH-CH=CH-CH 3 Calculate the double bond equivalent (DBE) for the molecular formula C 4H 6 . 2 1 3 0 The correct IUPAC name of the compound CH 3-CH(Cl)-COOH is: 2-Chloropropanoic acid 1-Chloropropanoic acid -Chloropropionic acid 2-Chloroethanoic acid The structure of isobutyl group in an organic compound is (CH3)2CH-CH2- CH3 - CH3 | CH - CH2 - CH3 CH3-CH2-CH2-CH2- (CH3)3C- Adsorption chromatography is based on the principle of: Differential adsorption of components on a stationary phase Differential solubility of components in a mobile phase Difference in boiling points of components Difference in molecular weights of components A compound with a molecular formula of C6H14 has two tertiary carbons. Its IUPAC name is : n-hexane 2-methylpentane 2,3-dimethylbutane 2,2-dimethylbutane What is the correct IUPAC name of the compound CH 3-CH(C 2H 5)-CH 2-CH 2-CHO ? 4-methylhexanal 2-ethylpentanal 4-ethylpentanal 3-methylhexanal The correct IUPAC name of CH 2=CH-CN is: Prop-2-enenitrile Vinyl cyanide Cyanoethene Ethene nitrile What is the hybridization of carbon atoms in allene ( CH 2=C=CH 2 )? sp 2 and sp Only sp 2 Only sp Only sp 3 The IUPAC name of neopentyl chloride is: 1-Chloro-2,2-dimethylpropane 2-Chloro-2-methylbutane 1-Chloropentane 2,2-Dimethyl-3-chloropropane The IUPAC name of the compound CH 3-CH=CH-C CH is: Pent-3-en-1-yne Pent-2-en-4-yne Pent-3-yne-1-ene Pent-2-yne-4-ene The Prussian blue color obtained during the Lassaigne's test for nitrogen is due to the formation of: Fe 4[Fe(CN) 6] 3 Calculated Na 4[Fe(CN) 6] Fe(CN) 3 None of the above In the Kjeldahl's method for estimation of nitrogen, the nitrogen present in the organic compound is converted into: Ammonium sulfate Ammonia gas Nitrogen gas Ammonium nitrate The hybridization of Carbon atoms in the CN - ion and HCONH 2 respectively are: sp and sp 2 sp 2 and sp 3 sp and sp 3 sp 2 and sp Glycerol can be purified by: Distillation under reduced pressure Steam distillation Simple distillation Fractional distillation What is the hybridization of carbon atoms in ethyne ( HC CH )? sp sp 2 sp 3 dsp 2 The number of and bonds in Pent-2-en-4-yne is: 10 , 3 8 , 5 11 , 2 9 , 4 A mixture of camphor and benzoic acid can be separated by: Chemical method (using NaHCO 3 ) Sublimation Fractional distillation Extraction with solvent The correct order of priority for the following groups in the Cahn-Ingold-Prelog (CIP) system is: -OH > -COOH > -CHO > -CH 2OH -COOH > -OH > -CHO > -CH 2OH -OH > -CHO > -COOH > -CH 2OH -CH 2OH > -CHO > -COOH > -OH In the Kjeldahl method, the organic compound is heated with concentrated H 2SO 4 in the presence of: K 2SO 4 and CuSO 4 NaCl KNO 3 Ca(OH) 2 In the Lassaigne's test for nitrogen, if both nitrogen and sulfur are present, the formation of which compound gives a blood-red color with Fe 3+ ? [Fe(SCN)] 2+ Na 4[Fe(CN) 5NOS] Fe 4[Fe(CN) 6] 3 Fe(OH) 3 The correct IUPAC name for the spiro compound with two rings of 2 and 4 carbons respectively sharing one carbon is: Spiro[2.4]heptane Spiro[3.5]octane Spiro[2.5]octane Spiro[4.2]heptane The IUPAC name of the compound CH 3-CO-CH 2-COOC 2H 5 is: Ethyl 3-oxobutanoate Ethyl 2-oxopropanoate Ethyl 3-ketobutanoic acid Ethyl acetylacetate The correct order of priority for the following functional groups in the IUPAC system of nomenclature is: -SO 3H > -COOH > -COCl > -CONH 2 -COOH > -SO 3H > -COCl > -CONH 2 -SO 3H > -COOH > -CONH 2 > -COCl -COOH > -COCl > -SO 3H > -CONH 2 The presence of halogen in an organic compound is detected by which of the following tests? Beilstein's test Mulliken-Barker test Libermann's nitroso test Victor Meyer's test The IUPAC name of the compound CH 3-CH(OH)-CH 2-CH(CH 3)-CHO is: 4-Hydroxy-2-methylpentanal 2-Methyl-4-hydroxypentanal 4-Hydroxy-2-methylbutanal 2-Hydroxy-4-methylpentanal The IUPAC name of Glycerol is: Propane-1,2,3-triol Propane-1,2-diol Butane-1,2,3-triol 1,2,3-Trihydroxypropane The IUPAC name of the compound (CH 3) 2C=CH-CO-CH 3 is: 4-Methylpent-3-en-2-one 2-Methylpent-2-en-4-one Mesityl oxide 1,1-Dimethylbut-1-en-3-one The priority order of functional groups in IUPAC nomenclature is correct in: -COOH > -SO 3H > -COOR > -COCl -OH > -NH 2 > -CHO > -COOH -CHO > -OH > -COOR > -COOH -CN > -CHO > -COOH > -OH During the Lassaigne's test for the detection of Nitrogen, the sodium fusion extract is boiled with iron(II) sulfate and then acidified with concentrated H 2SO 4 . The formation of which complex confirms the presence of Nitrogen? Fe 4[Fe(CN) 6] 3 Na 4[Fe(CN) 5NOS] Fe(SCN) 3 Na 3[Fe(CN) 6] According to the CIP (Cahn-Ingold-Prelog) rules, the correct priority order for the following groups is: -OH > -CHO > -CH 2OH > -CH 3 -CHO > -OH > -CH 3 > -CH 2OH -CH 2OH > -CHO > -OH > -CH 3 -OH > -CH 2OH > -CHO > -CH 3 Identify the correct IUPAC name of the compound Spiro[2.4]heptane. Spiro[2.4]heptane Spiro[3.4]octane Bicyclo[2.2.1]heptane Spiro[2.5]octane Identify the number of electrons in the following heterocyclic compound: Pyrrole. 6 4 2 8 The IUPAC name of the compound CH 3-CH 2-O-C(CH 3) 3 is: 2-ethoxy-2-methylpropane tert-butyl ethyl ether 1-ethoxy-1,1-dimethylethane Ethyl tert-butyl ether Which of the following statements regarding the Kjeldahl method is correct? It is not applicable to compounds containing nitrogen in the ring, like pyridine. It is used to estimate the percentage of phosphorus in an organic compound. Nitrogen in nitro groups can be directly estimated by this method without reduction. Copper sulfate acts as an oxidizing agent in this method. Separation of two microscopic components of a mixture based on their different partition coefficients between two liquid phases is: Partition Chromatography Adsorption Chromatography Thin Layer Chromatography Steam Distillation The Lassaigne's extract is boiled with concentrated HNO 3 before testing for halogens because: To decompose CN - and S 2- ions which interfere with the silver nitrate test. To increase the concentration of silver ions. To prevent the precipitation of AgCl . To oxidize Na to Na + . The correct IUPAC name for the following compound is: [Benzene ring with -Cl at position 1, -NO 2 at position 2, and -NO 2 at position 4] 1-chloro-2,4-dinitrobenzene 4-chloro-1,3-dinitrobenzene 1,3-dinitro-4-chlorobenzene 2-chloro-1,5-dinitrobenzene How many and bonds are present in Tetracyanoethylene? 9 and 9 5 and 9 9 and 7 5 and 5 The number of possible structural isomers for the alkane C 6H 14 is: 5 4 6 7 The hybridization of carbon atoms in Tetracyanomethane, C(CN) 4 , is: sp 3 and sp sp 2 and sp Only sp 3 sp 3 and sp 2 In the Carius method for the estimation of halogens, 0.15 g of an organic compound gave 0.12 g of AgI . What is the percentage of iodine in the compound? (Atomic mass: Ag=108, I=127 ) 43.2% 35.1% 52.4% 25.0% The IUPAC name of the compound with a six-membered ring containing one double bond and an -OH group on the carbon adjacent to the double bond is: Cyclohex-2-en-1-ol Cyclohex-1-en-2-ol 1-hydroxycyclohex-2-ene 2-hydroxycyclohex-1-ene In the Dumas method for the estimation of nitrogen, why is CO 2 gas used? To drive out all the air from the apparatus. To oxidize the organic compound. To react with nitrogen and form a solid. To reduce nitrogen oxides to nitrogen gas. What is the IUPAC name for CH 3-CH 2-CH(CH 3)-CO-COOH ? 3-methyl-2-oxopentanoic acid 2-keto-3-methylpentanoic acid 3-methyl-2-oxobutanoic acid 4-methyl-2-oxopentanoic acid In the detection of phosphorus in an organic compound, the formation of a yellow precipitate is due to: Ammonium phosphomolybdate Sodium phosphate Ammonium phosphate Ferric phosphate What is the correct IUPAC name for the compound CH 3-C(CH 3) 2-CH 2-CH(OH)-CH 3 ? 4,4-Dimethylpentan-2-ol 2,2-Dimethylpentan-4-ol 2-Hydroxy-4,4-dimethylpentane 4-Hydroxy-2,2-dimethylpentane The hybridization of carbon atoms in H 2C=C=CH 2 (allene) are: sp 2 and sp sp 2 only sp 3 and sp sp 2 and sp 3 Which among the following is a 'Lassaigne's filtrate' used for? To convert covalent bonds of N, S, P and Halogens into ionic forms. To purify the organic compound by crystallization. To measure the boiling point of the compound. To determine the molecular weight of the compound. Beilstein's test is used for the detection of which of the following in organic compounds? Halogens Nitrogen Sulfur Phosphorus The IUPAC name of the compound CH 3-CH 2-O-CH 2-CH 2-CH 3 is: 1-Ethoxypropane 2-Ethoxypropane Ethyl propyl ether Propoxyethane The IUPAC name of the compound 2,2,4-trimethylpentane is also known commonly as: Isooctane Neooctane Isopentane Neopentane The IUPAC name of the ester CH 2=C(CH 3)COOCH 3 is: Methyl 2-methylprop-2-enoate Methyl 2-methylacrylate Methyl 1-methylprop-2-enoate Methyl 2-methylethene carboxylate Which of the following carboxylic acids is most reactive towards esterification with methanol? HCOOH CH 3COOH (CH 3) 2CHCOOH (CH 3) 3CCOOH The IUPAC name of the compound CH 3-CH 2-CH(CH 3)-CH 2-C≡CH is: 4-methylhex-1-yne 3-methylhex-5-yne 4-ethylpent-1-yne 2-ethylpent-4-yne In the Carius method for the estimation of phosphorus, the phosphorus present in the organic compound is first oxidized to: Phosphoric acid Phosphorous acid Phosphine Phosphorus pentoxide IUPAC Name of some compounds are given. Which one is incorrect - 3-Methyl-4-ethyl-heptane 4-Methyl-2-pentyne The IUPAC name of is:- 3,4-dimethylpentanoyl chloride 1-chloro-1-oxo-2,3-dimethylpentane 2-ethyl-3-methylbutanoyl chloride 2,3-dimethylpentanoyl chloride The IUPAC name of the compound having the formula CH C - CH = CH 2 is - 1-butene-3-yne 3-buten-1-yne 1-butyn-3-ene but-1-yn-3-ene