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

(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 (pK_a 3.77)

[B] C₆H₅COOH (pK_a 4.22)

[C] CH₃COOH (pK_a 4.71)

[D] CH₃CH₂COOH (pK_a 4.88)

Answer: HCOOH (pK_a 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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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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