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Class 12 Chemistry Chapter 12 Aldehydes, Ketones and Carboxylic Acids MCQs | Class 12 Chemistry Chapter 12 Aldehydes, Ketones and Carboxylic Acids Multiple Choice Questions (MCQs) and Answers

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(1) Benzoic acid reacts with conc.HNO3 and conc.H2SO4 to give
[A] o-nitrobenzoic acid
[B] p-nitrobenzoic acid
[C] m-nitrobenzoic acid
[D] o,p-dinitrobenzoic acid
Answer: m-nitrobenzoic acid
(2) An inorganic compound producing an organic compound on heating is
[A] ammonium cyanate
[B] soda lime
[C] sodamide
[D] potassium cyanide
Answer: ammonium cyanate
(3) The reaction of ethyl formate with an excess of CH3MgI followed by hydrolysis gives
[A] ethanol
[B] n-propyl alcohol
[C] propanal
[D] isopropyl alcohol
Answer: isopropyl alcohol
(4) Formic acid and acetic acid are distinguished by reaction with
[A] sodium ethoxide
[B] sodium
[C] HgCl2
[D] 2,4-dinitrophenylhydrazine
Answer: HgCl2
(5) Heating a mixture of sodium benzoate and soda lime gives
[A] calcium benzoate
[B] benzene
[C] sodium benzoate
[D] methane
Answer: benzene
(6) A mixture of benzaldehyde and formaldehyde on heating with aqueous NaOH solution gives
[A] benzyl alcohol + sodium formate
[B] sodium benzoate + methanol
[C] benzyl alcohol + methanol
[D] sodium benzoate + sodium formate
Answer: benzyl alcohol + sodium formate
(7) Which of the following has the most acidic hydrogen?
[A] hexane-2,4-dione
[B] hexane-2,3-dione
[C] hexane-2,5-dione
[D] hexane-3-one
Answer: hexane-2,4-dione
(8) A new C-C bond formation is possible in
[A] cannizzaro reaction
[B] friedel crafts reaction
[C] clemmensen reduction
[D] reimer tiemann reaction
Answer: friedel crafts reaction
(9) Under Wolff-Kishner reduction conditions, the conversions which may be brought about are
[A] cyclohexanone into cyclohexane
[B] benzaldehyde into benzyl alcohol
[C] cyclohexanone into cyclohexanol
[D] benzophenone into diphenylmethane
Answer: cyclohexanone into cyclohexane
(10) The formation of cyanohydrin from a ketone is an example of
[A] electrophilic addition
[B] nucleophilic addition
[C] nucleophilic substitution
[D] electrophilic substitution
Answer: nucleophilic addition
(11) Acetone reacts with iodine (I2) to form iodoform in the presence of
[A] CaCO3
[B] NaOH
[C] KH
[D] MgCO3
Answer: NaOH
(12) Which of the following compounds with molecular formula, C5H10 yields acetone on ozonolysis? 
[A] 2-methyl-2-butene
[B] 3-methyl-1-butene
[C] Cyclopentane
[D] 2-methyl-1-butene
Answer: 2-methyl-2-butene
(13) Among acetic acid, phenol and n-hexanol which one of the following compound will react with NaHCO3 solution to give sodium salt and CO2?
[A] Acetic acid
[B] n-hexanol
[C] Acetic acid and phenol
[D] Phenol
Answer: Acetic acid
(14) The reagent used for the separation of acetaldehyde from acetophenone is
[A] NaHSO3
[B] C6H5NHNH2
[C] NH2OH
[D] NaOH and I2
Answer: NaHSO3
(15) Iodoform test is not given by
[A] 2-pentanone
[B] ethanol
[C] ethanal
[D] 3-pentanone
Answer: 3-pentanone
(16) Two isomeric ketones 3-Pentanones and 2-pentanone can be distinguished by
[A] I2/NaOH only
[B] NaHSO3 only
[C] NaCN/HCl
[D] both of (a) and (b)
Answer: both of (a) and (b)
(17) Products of the following reaction
[A] CH3CHO + CH3CH2CHO
[B] CH3COOH + CH3COCH3
[C] CH3COOH + HOOC.CH2CH3
[D] CH3COOH + CO2
Answer: CH3COOH + HOOC.CH2CH3
(18) Which alkene on ozonolysis gives CH3CH2CHO and CH3COCH3
[A]
[B] CH3CH2CH=CHCH2CH3
[C] CH3CH2CH=CHCH3
[D]
Answer:
(19) The major organic product formed from the following reaction
[A]
[B]
[C]
[D]
Answer:
(20) Benzoic acid gives benzene on being heated with X and phenol gives benzene on being heated with Y. Therefore, X and Y are respectively
[A] Sodalime and copper
[B] Zn dust and NaOH
[C] Cu and sodalime
[D] Sodalime and zinc dust
Answer: Sodalime and zinc dust

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