Free NEET Chemistry multiple-choice questions on Alkenes & Alkynes. Attempt each question and reveal the answer with a full explanation.
The major product of the reaction between CH 3CH 2CH=CH 2 and HBr in the presence of H 2O 2 is: 1-bromobutane 2-bromobutane 1,2-dibromobutane 1-hydroxy-2-bromobutane The number of acidic hydrogens in one molecule of ethyne is: 2 1 3 0 Predict the major product ‘P’ in the following sequence of reactions- (i) HBr, benzoyl peroxide (ii) KCN (iii) Na (Hg)/ C2H5OH The reaction of C 6H 5CH=CHCH 3 with HBr produces: C 6H 5CH(Br)CH 2CH 3 C 6H 5CH 2CH(Br)CH 3 C 6H 5CH 2CH 2CH 2Br C 6H 5CH(Br)CH(Br)CH 3 What is the major product formed when 3,3-dimethyl-1-butene reacts with HCl ? 2-Chloro-2,3-dimethylbutane 3-Chloro-2,2-dimethylbutane 1-Chloro-3,3-dimethylbutane 2-Chloro-3,3-dimethylbutane The addition of HBr to 3-phenylpropene in the absence of peroxides yields: 1-Bromo-1-phenylpropane 2-Bromo-1-phenylpropane 3-Bromo-1-phenylpropane 1,2-Dibromo-3-phenylpropane A mixture of potassium maleate on electrolysis yields: Ethyne Ethene Ethane Methane In the presence of peroxide, the addition of HCl to propene follows: Markovnikov's rule Anti-Markovnikov's rule Saytzeff's rule Hund's rule Which of the following is most reactive towards nucleophilic addition? (Note: Context of Hydrocarbon derivatives related to stability) Ethyne Ethene Ethane Benzene The major product of the reaction between 3-methyl-1-butene and HCl is: 2-Chloro-2-methylbutane 2-Chloro-3-methylbutane 1-Chloro-3-methylbutane 2,2-Dichlorobutane Which of the following reagents is used for the hydration of an alkene according to Markovnikov's rule without the risk of carbocation rearrangement? Hg(OAc) 2/H 2O followed by NaBH 4 B 2H 6/THF followed by H 2O 2/OH - Dilute H 2SO 4 Concentrated H 2SO 4 Ozonolysis of 1-methylcyclohexene followed by reduction with Zn/H 2O yields: 6-oxoheptanal Heptanedial 6-methylheptanal Cyclohexanone and methanal Which type of isomerism is shown by 2-butene? Geometrical isomerism Optical isomerism Chain isomerism Functional isomerism Ozonolysis of 2-pentyne followed by treatment with H 2O 2 (oxidative workup) gives: Ethanoic acid and propanoic acid Ethanal and propanal Pentanoic acid Acetone and acetic acid Which of the following can represent the major product when propene reacts with Cl 2 in the presence of water? 1-chloro-2-propanol 2-chloro-1-propanol 1,2-dichloropropane 1,3-dichloropropane The correct order of increasing acidic strength is: CH 3CH 3 < CH 2=CH 2 < CH ≡ CH < H 2O CH ≡ CH < CH 2=CH 2 < CH 3CH 3 < H 2O H 2O < CH ≡ CH < CH 2=CH 2 < CH 3CH 3 CH 3CH 3 < CH ≡ CH < CH 2=CH 2 < H 2O The peroxide effect (Kharasch effect) is observed only with HBr and not with HCl or HI because: Both propagation steps are exothermic only for HBr The H-Cl bond is too strong and H-I bond is too weak Chlorine free radicals are more stable than bromine free radicals Bromine is a liquid while chlorine is a gas The reaction of bromine with cis-2-butene gives: dl-2,3-dibromobutane (Racemic mixture) meso-2,3-dibromobutane Only d-2,3-dibromobutane Only l-2,3-dibromobutane The reaction of acetylene with hypochlorous acid ( HOCl ) yields: Dichloroacetaldehyde 1,1-dichloroethane 1,2-dichloroethene Chloroacetaldehyde Hydroboration-oxidation of 1-methylcyclopentene gives: trans-2-methylcyclopentanol cis-2-methylcyclopentanol 1-methylcyclopentanol 2,2-dimethylcyclobutanol The reaction of CH 3CH=CH 2 with B 2D 6 followed by H 2O 2/OH - gives: CH 3CH(D)CH 2OH CH 3CH(OH)CH 2D CH 3CH(D)CH 2D CH 3CH(OH)CH 2OH During the Kolbe's electrolytic decarboxylation of potassium succinate, the product formed at the anode is: Ethene Ethane Ethyne Methane The reaction of propene with ICl (Iodine monochloride) yields: 2-Iodo-1-chloropropane 1-Iodo-2-chloropropane 1,2-Diiodopropane 1,2-Dichloropropane Which of the following hydrocarbons has the most acidic hydrogen? Ethyne Ethene Ethane Benzene In the reaction of 3,3,3-trifluoropropene with HBr , the major product is formed according to: Anti-Markovnikov's rule due to the strong -I effect of the CF 3 group Markovnikov's rule due to the stability of the secondary carbocation Anti-Markovnikov's rule due to the peroxide effect Markovnikov's rule because fluorine is more electronegative The addition of Br 2 to trans-2-butene yields: meso-2,3-dibromobutane ( )-2,3-dibromobutane 1,2-dibromobutane 1,4-dibromobutane Which reagent set allows the hydration of an alkene to an alcohol with Markovnikov regioselectivity but without carbocation rearrangements? Hg(OAc) 2/H 2O followed by NaBH 4 B 2H 6 followed by H 2O 2/OH - Dilute H 2SO 4 Concentrated H 2SO 4 followed by boiling water The addition of 1 mole of Br 2 to 1,3-butadiene at 40 ∘C (high temperature) primarily yields: 1,4-dibromo-2-butene 1,2-dibromo-3-butene 1,1-dibromobutane 2,3-dibromobutane The Kharasch effect (anti-Markovnikov addition) is not observed in the addition of HI to propene because: The H-I bond is too strong to be broken by radicals The step involving the addition of iodine radical to the alkene is endothermic Iodine radicals immediately combine to form I 2 Both the addition of radical to alkene and the abstraction of H from HI are endothermic The correct order of acidity for the following compounds is: H 2O > CH≡CH > NH 3 > CH 3-CH 3 CH≡CH > H 2O > NH 3 > CH 3-CH 3 H 2O > NH 3 > CH≡CH > CH 3-CH 3 NH 3 > H 2O > CH≡CH > CH 3-CH 3 The reaction of cis-2-butene with cold, dilute, alkaline KMnO 4 yields: meso-Butane-2,3-diol ()-Butane-2,3-diol 2-Butanol Butanal The addition of 1 mole of HBr to 1,3-butadiene at low temperature ( -80 ∘C ) results in the major product: 3-Bromo-1-butene 1-Bromo-2-butene 1,4-Dibromo-2-butene 2,3-Dibromobutane What is the major product formed when 2-methyl-2-butene reacts with BD 3 followed by H 2O 2/OH - ? 3-methyl-2-butanol- d 2-methyl-2-butanol- d 3-methyl-2-butanol 2-methyl-1-butanol Ozonolysis of 1,3-butadiene followed by reduction with Zn/H 2O yields: Formaldehyde and Glyoxal Formaldehyde and Acetaldehyde Glyoxal only Propanal and Methanal Which of the following alkenes is most reactive towards the addition of HBr ? 2-Methylpropene Propene Ethene Trans-2-butene Reaction of propene with B 2D 6 followed by H 2O 2/OH - produces: CH 3CH(OH)CH 2D CH 3CH(D)CH 2OH CH 3CH(OH)CH 2OH CH 3CH(D)CH 2D Given below are two statements : In the light of the above statements, choose the most appropriate answer from the options given below. Both Statement I and Statement II are correct Both Statement I and Statement II are incorrect Statement I is correct but Statement II is incorrect Statement I is incorrect but Statement II is correct Consider the following reaction sequences and choose the correct option. K and L are geometrical isomers K and L are enantiomers M and N are geometrical isomers M and N are stereoisomers Among the following, the compound having conjugated double bonds is hepta-1,3-diene hepta-1,4-diene hepta-1,5-diene hepta-1,6-diene In the following reaction, the product (A) is: CH CH [HgSO 4] H 2SO 4 A Acetaldehyde Acetone Vinyl alcohol Ethyl alcohol What is the product formed when CaC 2 reacts with D 2O ? C 2D 2 CD 4 Ca(OD) 2 C 2D 4 The bond angle in the sp 2 hybridized carbon of an alkene is approximately: 120 109.5 180 90 The ozonolysis of an alkene yields acetone and formaldehyde. The alkene is: 2-Methyl-1-propene 2-Butene 2-Methyl-2-butene Propene Which of the following reagents will convert 2-hexyne into trans-2-hexene? Na / liq. NH 3 H 2 / Pd-C, quinoline LiAlH 4 NaBH 4 Which of the following compounds will not react with AgNO 3 in ammoniacal solution? CH3-C≡C-CH3 CH≡C-CH2-CH3 CH≡CH CH3-C≡CH The reaction of calcium carbide with water produces: Ethyne Ethene Methane Ethane What is the specific role of 'quinoline' or 'sulfur' in Lindlar's catalyst used for the partial hydrogenation of alkynes? To poison the catalyst and prevent further reduction of the alkene to an alkane To act as a co-catalyst to speed up the reaction To ensure that the trans-alkene is the major product To increase the surface area of the palladium catalyst The Markovnikov addition of HBr to propene involves the formation of a secondary carbocation. This preference is primarily governed by: The stability of the intermediate carbocation The strength of the C-H bond formed The electronegativity of the halogen The steric hindrance of the methyl group Which of the following is the best reagent to convert hex-3-yne to cis-hex-3-ene? H 2 , Pd/CaCO 3 , quinoline Na / liq. NH 3 LiAlH 4 Zn/HCl Oxymercuration-demercuration of propene yields: 2-Propanol 1-Propanol Propanone Propane-1,2-diol Hydroboration-oxidation of 2-methylpropene gives: 2-Methyl-1-propanol 2-Methyl-2-propanol Butane-1,2-diol 2-Methylpropane An organic compound 'A' ( C 4H 8 ) on ozonolysis gives two moles of acetaldehyde. The structure of 'A' is: CH 3CH=CHCH 3 CH 3CH 2CH=CH 2 (CH 3) 2C=CH 2 Cyclobutane Which of the following molecules has a zero dipole moment? trans-1,2-dichloroethene cis-1,2-dichloroethene Chlorobenzene 1,1-dichloroethene Which of the following reagents can be used to distinguish between ethene and ethyne? Ammoniacal Cu 2Cl 2 Bromine water Alkaline KMnO 4 Chlorine in CCl 4 Which is the monomer of Neoprene in the following? CH2=CH-C CH CH2 = CH3 | C - CH = CH2 CH2 = Cl | C - CH = CH2 CH2=CH-CH=CH2 The number of sigma ( ) and pi ( ) bonds in pent-2-en-4-yne is 13 bonds and no bonds 10 bonds and 3 bonds 8 bonds and 5 bonds 11 bonds and 2 bonds Which of the following compounds will not show geometrical isomerism? Propene But-2-ene 1,2-Dichloroethene Pent-2-ene The most suitable reagent for the following conversion, is : Hg 2+ /H+, H2O Na/liquid NH3 H2 , Pd/C, quinoline Zn/HCl Which amongst the following molecules on polymerization produces neoprene? H2C=CH-CH=CH2 H2C = Cl | C - CH = CH2 H2C=CH-C CH H2C = CH3 | C - CH = CH2 Which one of the following compounds does not decolourize bromine water? An alkene on ozonolysis gives methanal as one of the products. Its structure is: CH 2=CH-CH 2-CH 3 Prop-1-ene But-2-ene 2-Methylbut-2-ene Which of the following reagents will be used to distinguish between 1-butyne and 2-butyne? Ammoniacal Cu 2Cl 2 Br 2/CCl 4 O 3/H 2O KMnO 4/OH - The hydrocarbon which can react with sodium in liquid ammonia is: CH 3CH 2C CH CH 3CH=CHCH 3 CH 3CH 2CH 2CH 3 CH 3C CCH 3 Reduction of 2-butyne with sodium in liquid ammonia gives: trans-2-butene cis-2-butene n-butane 1-butyne What is the major product of the reaction between propene and B 2H 6 followed by H 2O 2/OH - ? Propan-1-ol Propan-2-ol Propane Propanone Dehydration of 2-butanol with concentrated H 2SO 4 mainly gives: trans-2-butene cis-2-butene 1-butene 2-methylpropene Which of the following is the most stable carbocation intermediate in the addition of HCl to 2-methylpropene? (CH 3) 3C + CH 3CH 2CH 2CH 2 + (CH 3) 2CHCH 2 + CH 3CH +CH 2CH 3 Which of the following will give a white precipitate with ammoniacal silver nitrate? But-1-yne But-2-yne But-1-ene Butane Propyne and propene can be distinguished by: Ammoniacal silver nitrate Bromine water Concentrated H 2SO 4 Dilute KMnO 4 In the reaction of CH 3-CH=CH 2 with HCl in the presence of peroxide, the product is: 2-Chloropropane 1-Chloropropane 1,2-Dichloropropane Propyl peroxide The number of sigma ( σ ) and pi ( π ) bonds in pent-2-en-4-yne is: 10 σ and 3 π 8 σ and 5 π 11 σ and 2 π 13 σ and 3 π Reaction of propyne with HgSO 4/H 2SO 4 gives: Acetone Propanal Propan-1-ol Acetic acid Which of the following has the highest dipole moment? cis-But-2-ene trans-But-2-ene But-1-yne Ethane The treatment of CH 3MgBr with CH 3C CH produces: CH 4 CH 3-CH=CH 2 CH 3-C C-CH 3 CH 3-CH 2-CH 3 The product formed when 1-butyne reacts with excess HBr is: 2,2-Dibromobutane 1,1-Dibromobutane 1,2-Dibromobutane 2,3-Dibromobutane Which of the following compounds reacts with NaNH 2 to liberate H 2 gas? CH 3-C CH CH 3-CH=CH 2 CH 3-CH 2-CH 3 CH 3-C C-CH 3 Ozonolysis of 2,3-dimethyl-2-butene followed by treatment with Zn/H 2O yields: Two molecules of acetone Two molecules of acetaldehyde One molecule of acetone and one of acetaldehyde Two molecules of propanal The reaction of cyclohexene with cold, dilute, alkaline KMnO 4 (Baeyer's reagent) yields: cis-Cyclohexane-1,2-diol trans-Cyclohexane-1,2-diol Adipic acid Cyclohexanone The reaction of HBr with propene in the presence of peroxide yields: n -Propyl bromide Isopropyl bromide Ethyl bromide 1,2-Dibromopropane Which reagent is used to convert 1-hexyne into 1-hexene? H 2 , Pd/BaSO 4 , quinoline Na in liquid NH 3 Sn/HCl LiAlH 4 Which of the following statements is true regarding the heat of hydrogenation of cis-2-butene and trans-2-butene? Cis-2-butene has a higher heat of hydrogenation than trans-2-butene Trans-2-butene has a higher heat of hydrogenation than cis-2-butene Both have the same heat of hydrogenation Heat of hydrogenation cannot be compared The reaction of 1-butyne with HgSO 4 and H 2SO 4 yields: Butanone Butanal Butan-1-ol Butan-2-ol Baeyer's reagent is used to detect unsaturation in organic compounds. The positive result is indicated by: Disappearance of purple color and formation of brown precipitate Formation of a white precipitate Evolution of H 2 gas Color change from orange to green Which of the following compounds is the most stable alkene? 2,3-Dimethyl-2-butene 2-Methyl-2-butene 2-Butene 1-Butene The reaction of CH 3C ≡ CH with CH 3MgBr yields: CH 4 CH 3-CH 2-CH 3 CH 3-C ≡ C-CH 3 CH 3-CH=CH 2 The reaction of propene with HOCl (Chlorine water) proceeds through which intermediate? Chloronium ion Carbocation Free radical Carbanion Which of the following describes the correctly assigned E/Z configuration for 2-bromo-2-butene? Z-isomer if high priority groups are on the same side E-isomer if high priority groups are on the same side Z-isomer if methyl groups are trans E-isomer if Br and H are cis When 1,2-dibromopropane is treated with excess NaNH 2 in liquid ammonia, the final product is: Propyne Propene 1-Bromopropene Cyclopropane The reaction of an alkene with OsO 4 followed by NaHSO 3/H 2O produces: cis-Diol trans-Diol Epoxide Aldehyde Which of the following alkenes is the most stable? 2,3-Dimethyl-2-butene 2-Methyl-2-butene 2-Butene 1-Butene Which of the following can be used to convert an alkene into a halohydrin? X 2 / H 2O X 2 / CCl 4 HX / Peroxide SOCl 2 / Pyridine In the presence of H 2O 2 , addition of HBr to unsymmetrical alkenes takes place contrary to Markovnikov's rule. This is because: The reaction follows a free radical mechanism where the bromine radical attacks first. The peroxide increases the electrophilicity of the proton. The carbocation formed is more stable. The reaction becomes endothermic. What is the product of the reaction between 1-butyne and H 2O in the presence of Hg 2+ /H + ? Butanone Butanal 2-Butanol 1-Butanol What is the major product when 3,3-dimethyl-1-butene undergoes hydroboration-oxidation? 3,3-Dimethyl-1-butanol 3,3-Dimethyl-2-butanol 2,3-Dimethyl-2-butanol 2,2-Dimethyl-1-butanol The electrophilic addition of Br 2 to ethene involves the formation of which cyclic intermediate? Cyclic bromonium ion Cyclic carbocation Cyclic carbanion Cyclic transition state without formal charges The stability of alkenes can be explained by hyperconjugation. Which of the following alkenes has the highest stability? 2,3-Dimethyl-2-butene 2-Methyl-2-butene Trans-2-butene 1-Butene Reductive ozonolysis of cyclohexene yields: Hexanedial Hexanedioic acid Pentanedial Cyclohexane-1,2-diol Which of the following alkynes will NOT produce a precipitate when treated with ammoniacal cuprous chloride solution? But-2-yne Ethyne Propyne But-1-yne The polymerization of ethyne by passing it through a red-hot iron tube leads to benzene. What is the product of linear polymerization of ethyne using a catalyst like CuCl/NH4Cl? Vinylacetylene Divinylacetylene Polyacetylene Neoprene Hydrolysis of magnesium carbide ( Mg 2C 3 ) yields which of the following hydrocarbons? Propyne Methane Ethyne Propene The reaction of 1-butene with Br 2 in CCl 4 yields: 1,2-Dibromobutane 1,1-Dibromobutane 2,2-Dibromobutane 1,3-Dibromobutane The oxidation of propene with hot, concentrated KMnO 4 solution produces: Ethanoic acid and CO 2 Propan-1,2-diol Propanone Methanoic acid and Ethanoic acid A terminal alkyne reacts with NaNH 2 to form a sodium salt. If this salt reacts with ethyl bromide, the product is: A higher alkyne An alkene An alkane A ketone Which of the following alkenes has the lowest heat of hydrogenation? trans-2-Butene cis-2-Butene 1-Butene Ethene Ozonolysis of cyclopentene followed by treatment with Zn/H 2O yields: Pentane-1,5-dial Cyclopentanol Cyclopentanone Pentanoic acid Hydroboration-oxidation of 2-methyl-2-butene yields which major product? 3-methyl-2-butanol 2-methyl-2-butanol 2-methyl-1-butanol 3-methyl-1-butanol Which of the following is produced when ethene reacts with sulfur monochloride ( S 2Cl 2 )? Mustard gas Lewisite Tear gas Phosgene Ozonolysis of Styrene (vinylbenzene) followed by Zn/H 2O treatment produces: Benzaldehyde and Formaldehyde Acetophenone and Formaldehyde Benzaldehyde and Acetaldehyde Benzoic acid and Formic acid When ethene reacts with bromine water ( Br 2/H 2O ), the major product formed is: 2-Bromoethanol 1,2-Dibromoethane Ethane-1,2-diol Bromoethene Which of the following compounds has the highest acidic character? HC ≡ CH CH 3-C ≡ CH CH 2 = CH 2 CH 3-CH 3 The addition of HI to 2-methyl-1-butene follows Markovnikov's rule. The major product is: 2-Iodo-2-methylbutane 1-Iodo-2-methylbutane 2-Iodo-3-methylbutane 3-Iodo-2-methylbutane The controlled hydrogenation of 2-butyne in the presence of Lindlar's catalyst ( Pd/CaCO 3 , poisoned by quinoline) gives: cis-2-Butene trans-2-Butene n-Butane 1-Butene The reaction of acetylene with HCN in the presence of Ba(CN) 2 catalyst yields: Acrylonitrile Ethyl cyanide Vinyl chloride Methyl isocyanide Reaction of 2-butyne with Baeyer's reagent (cold, dilute, alkaline KMnO 4 ) yields: Butane-2,3-dione Butane-2,3-diol Ethanoic acid Butanal When 1,3-butadiene reacts with 1 mole of HBr at 40 C , the major product is: 1-bromo-2-butene 3-bromo-1-butene 1,4-dibromo-2-butene 2-bromo-2-butene The reaction of propene with ICl (Iodine monochloride) produces: 2-chloro-1-iodopropane 1-chloro-2-iodopropane 1,2-dichloropropane 1,2-diiodopropane The reaction of 1-alkyne with NaNH 2 in liquid NH 3 followed by reaction with an alkyl halide is a method to prepare: Higher alkynes Alkanes Alkenes Alcohols What is the order of reactivity of the following towards HBr ? (I) CH 2=CH 2 , (II) CH 3CH=CH 2 , (III) (CH 3) 2C=CH 2 III > II > I I > II > III II > I > III III > I > II In the reaction of propyne with HgSO 4/H 2SO 4 , the intermediate enol formed is: CH 3C(OH)=CH 2 CH 3CH=CH(OH) CH 2=C(OH)CH 3 CH 3C(OH)=CH(OH) Which one of the following alkenes will react faster with H2 under catalytic hydrogenation conditions :- [R = Alkyl substituent] The monomer of the polymer : is :- CH3CH=CH.CH3 CH3CH=CH2 (CH3)2C=C(CH3)2 Products of the following reaction : CH3C CCH2CH3 (i) O3 (2)Hydrolysis are - CH3COOH + CH3COCH3 CH3COOH + HOOC.CH2CH3 CH3CHO + CH3CH2CHO CH3COOH + CO2 Which of the following is the correct order of acidity for the given hydrocarbons? HC CH > CH 2=CH 2 > CH 3-CH 3 CH 3-CH 3 > CH 2=CH 2 > HC CH CH 2=CH 2 > HC CH > CH 3-CH 3 HC CH > CH 3-CH 3 > CH 2=CH 2 Predict the product C obtained in the following reaction of butyne-1. CH3CH2-C CH + HCl -> B B ->[HI] C CH3CH2CH2CH(I)Cl CH3CH2CH(I)CH2Cl CH3CH2C(I)(Cl)CH3 CH3CH(Cl)CH2CH2I Which of the compounds with molecular formula C5H10 yields acetone on ozonolysis? 3-methyl-1-butene cyclopentane 2-methyl-1-butene 2-methyl-2-butene. Identify Z in the sequence of reactions: CH3CH2CH=CH2 ->[HBr/H2O2] Y ->[C2H5ONa] Z CH3-(CH2)3-O-CH2CH3 (CH3)2CH2-O-CH2CH3 CH3(CH2)4-O-CH3 CH3CH2 - CH3 | CH - O - CH2CH3 In the reaction H-C CH ->[(1)NaNH2 / liq.NH3][(2)CH3CH2Br] X ->[(1)NaNH2 / liq.NH3][(2)CH3CH2Br] Y X and Y are : X = 1-Butyne ; Y = 3-Hexyne X = 2-Butyne ; Y = 3-Hexyne X = 2-Butyne ; Y = 2-Hexyne X = 1-Butyne ; Y = 2-Hexyne An alkene "A" on reaction with O3 and Zn-H2O gives propanone and ethanal in equimolar ratio. Addition of HCl to alkene "A" gives "B" as the major product. The structure of product "B" is: H3C - Cl | CH - CH3 | CH - CH3 Cl - CH2 - CH2 - CH3 | CH3 | CH H3C - CH2 - CH2Cl | CH - CH3 H3C - CH2 - CH3 | Cl | C - CH3 An alkene on ozonolysis gives methanal as one of the product. Its structure is The major product of the following chemical reaction is : Compound X on reaction with O3 followed by Zn/H2O gives formaldehyde and 2-methyl propanal as products. The compound X is 2-Methylbut-1-ene 2-Methylbut-2-ene Pent-2-ene 3-Methylbut-1-ene Identify the correct reagents that would bring about the following transformation. (i) H2O/H+ (ii) CrO3 (i) BH3 (ii) H2O2/OH - (iii) PCC (i) BH3 (ii) H2O2/OH - (iii) alk. KMnO4 (iv) H3O+ (i) H2O/H+ (ii) PCC For the given reaction: ‘P’ is