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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) with Answers

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(1) The IUPAC name of tartaric acid is:
[A] 2,3-dihydroxy butane-1-4-dicarboxylic acid
[B] 1,4-dihydroxy butane-2-3-dioic acid
[C] butane-1 4-dicarboxylic acid
[D] none of the above
Answer: 2,3-dihydroxy butane-1-4-dicarboxylic acid
(2) Cyanohydrin of which compound gives lactic acid on hydrolysis?
[A] Acetone
[B] Acetaldehyde
[C] Propanal
[D] HCHO
Answer: Acetaldehyde
(3) Which of the following is the strongest acid?

[A] HCOOH (pKa 3.77)
[B] C6H5COOH (pKa 4.22)
[C] CH3COOH (pKa 4.71)
[D] CH3CH2COOH (pKa 4.88)
Answer: HCOOH (pKa 3.77)
(4) Which of the following would produce secondary alcohol?
[A]
[B]
[C]
[D]
Answer:
(5) Amongst the following carboxylic acids the strongest acid is:
[A] benzoic acid
[B] 0-methoxybenzoic acid
[C] m-nitrobenzoic acid
[D] p-nitrobenzoic acid
Answer: p-nitrobenzoic acid
(6) Ethanal reacts with HCN and the addition product so obtained is hydrolysed to form a new compound. The compound shows
[A] optical isomerism
[B] geometrical isomerism
[C] tautomerism
[D] metamerism
Answer: optical isomerism
(7) Ethyl acetate on reaction with excess of methyl magnesium chloride and dil. H2SO4 gives
[A] dimethyl ketone
[B] iso propyl alcohol
[C] ethyl aceto acetate
[D] t-butyl alcohol
Answer: t-butyl alcohol
(8) A mixture of benzaldehyde and formaldehyde on heating with aqueous (conc.)NaOH solution gives
[A] benzyl alcohol and sodium formate
[B] sodium benzoate and methyl alcohol
[C] sodium benzoate and sodium formate
[D] none of these
Answer: benzyl alcohol and sodium formate
(9) Phenolphthalein is produced on heating phthalic anhydride and conc. sulphuric acid with
[A] Salicylic acid
[B] Phenol
[C] Phenacetin
[D] Phenanthrene
Answer: Phenol
(10)
In the above reaction, X and Y are:
[A] Identical
[B] Homologes
[C] Structural Isomers
[D] Stereoisomers
Answer: Homologes
(11) Which compound is most reactive towards nucleophilic addition?
[A] CH3CHO
[B] PhCOCH3
[C] PhCOPh
[D] CH3COCH3
Answer: CH3CHO
(12)
is fastest when X is
[A] Cl
[B] NH2
[C] OC2H5
[D] OCOR
Answer: Cl
(13) In a set of reaction propionic acid yielded a compound D.

The structure of D would be
[A] CH3CH2NHCH3
[B] CH3CH2NH2
[C] CH3CH2CH2NH2
[D] CH3CH2CONH2
Answer: CH3CH2NH2
(14)
[A] Identical (Homomer)
[B] Not isomer
[C] Positional isomer
[D] Function group isomer
Answer: Not isomer
(15)
[A] CH≡CH
[B] CHI3
[C] Ph-COONa
[D] CH2=CH2
Answer: CH≡CH
(16) The slowest step of Cannizarro's reaction is
[A] Attack of nucleophilic
[B] Hydride shift
[C] Formation of anion
[D] Transfer of proton
Answer: Hydride shift
(17) CH2=CH-CHO+HCN→A(Major)

the compound 'A' is

[A] CH2=CH-CH-CH(OH)(CN)
[B] CH3-CH(CN)-CHO
[C] CH2(CN)-CH2-CHO
[D] CH3-C(OH)(CN)-CH3
Answer: CH2(CN)-CH2-CHO
(18) Which acid deravative is most reactive towards nucleophilic substitution reaction?
[A] CH3COCl
[B] (CH3CO)2O
[C] CH3COOC2H5
[D] CH3CONH2
Answer: CH3COCl
(19) Why does the reaction produce stable salt?

Because
[A] In 'A' the ring is aromatic
[B] 6 p electrons are present
[C] Ring in a is stabilised by closed loop conjugation
[D] All of these
Answer: All of these
(20) The number of stereoisomeric products formed in the following reaction is
[A] 1
[B] 2
[C] 4
[D] 8
Answer: 2

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