Class 12 Chemistry Chapter 12 Aldehydes, Ketones and Carboxylic Acids Short Questions and Answers | Class 12 Chemistry Chapter 12 Aldehydes, Ketones and Carboxylic Acids Quiz

(1) Polarisation of electrons in acrolein may be written as

[A]

[B]

[C]

[D]

Answer:

(2) Consider the following reaction;
CH3Br + Mg
compound C is:

[A] acetic acid

[B] acetaldehyde

[C] ethyl alcohol

[D] formic acid

Answer: ethyl alcohol

(3) The conversion of CH₃OH to CH₃COOH can be brought in by:

[A] K₂Cr₂O₇/H⁺

[B] CO + Rh

[C] KMnO₄

[D] H₃PO₄

Answer: CO + Rh

(4) Benzaldehyde and acetaldehyde can be distinguished by:

[A] iodoform test

[B] 2:4 DNP test

[C] NH₃ reaction

[D] Wolff-Kishner's reduction

Answer: iodoform test

(5) Fehling's solution is:

[A] acidified copper sulphate solution

[B] ammoniacal cuprous chloride solution

[C] copper sulphate, Rochelle salt + NaOH

[D] none of the above

Answer: copper sulphate, Rochelle salt + NaOH

(6) Which compounds will not reduce Fehling's solution?

[A] Methanal

[B] Ethanal

[C] Trichloroethanal

[D] Benzaldehyde

Answer: Benzaldehyde

(7) Acetaldehyde normally reacts with

[A] only electrophiles

[B] only nucleophiles

[C] only free radicals

[D] both electrophiles and nucleophiles

Answer: only nucleophiles

(8) Muscone (an explosive perfume secreted by musk deer) has the structure

Its IUPAC name is:

[A] 3-methyl cyclopentadecanone

[B] methyl cyclopentadecan-3-one

[C] 3-methyl cyclotetradecanone

[D] 3-methyl cyclohexadecan-3-one

Answer: 3-methyl cyclopentadecanone

(9) Which of the following has most acidic hydrogen?

[A] 3-hexanone

[B] 2,4-hexanedione

[C] 2,5-hexanedione

[D] 2,3-hexanedione

Answer: 2,4-hexanedione

(10) Which can be reduced to corresponding hydrocarbon by Zn-Hg/conc HCl?

[A] Butan-2-one

[B] Acetic acid

[C] Acetamide

[D] Ethyl acetate

Answer: Butan-2-one

(11) Nucleophilic addition reaction will be most favoured in

[A]

[B] (CH₃)₂C=O

[C] CH₃CH₂CHO

[D] CH₃CHO

Answer: CH₃CHO

(12) The enolic form of acetone contains:

[A] 9 σ-bonds, 1π-bond and 2 lone pairs

[B] 8 σ-bonds, 2π-bonds and 2 lone pairs

[C] 10 σ-bonds, 1π-bond and 1 lone pair

[D] 9 σ-bonds, 2π-bonds and 1 lone pair

Answer: 9 σ-bonds, 1π-bond and 2 lone pairs

(13) In this reaction,

an asymmetric compound is generated. The acid obtained would be

[A] 50% D + 50% L-isomer

[B] 20% D + 80% L-isomer

[C] D-isomer

[D] L-isomer

Answer: 50% D + 50% L-isomer

(14) Ethane can be obtained from ethanal in one step by:

[A] Na-Hg + water

[B] Zn-Hg + conc.HCl

[C] aluminium isopropoxide and isopropyl alcohol

[D] LiAlH₄ + ether

Answer: Zn-Hg + conc.HCl

(15) Which one of the following compounds on treatment with LiAlH₄ will give a product that will give a positive iodoform test?

[A] CH₃CH₂CHO

[B] CH₃CH₂COOCH₃

[C] CH₃CH₂OCH₂CH₃

[D] CH₃COCH₃

Answer: CH₃COCH₃

(16) Aldehydes and ketones will not form crystalline derivatives with

[A] sodium bisulphite

[B] phenyl hydrazine

[C] semicarbazide hydrochloride

[D] dihydrogen sodium phosphate

Answer: dihydrogen sodium phosphate

(17) Oxalic acid on treatment with conc. H₂SO₄ gives:

[A] CO + H₂O₂

[B] H₂O +CO+CO₂

[C] HCOOH + CO₂

[D] HCOOH + CO₂ +O₂

Answer: H₂O +CO+CO₂

(18) Benzene sulphonic acid on treating with P₂O₅ gives:

[A] salicylic acid

[B] benzoic acid

[C] acid anhydride

[D] sodium benzoate

Answer: acid anhydride

(19) The IUPAC name of crotonaldehyde is:

[A] propenal

[B] but-2-en-l-al

[C] butan-2-en-l-al

[D] none of these

Answer: but-2-en-l-al

(20) The IUPAC name of the CH₃COCH(CH₃)₂ is:

[A] 4-methyl isopropyl ketone

[B] 3-methyl-2-butanone

[C] isopropylmethyl ketone

[D] 2-methyl-3-butanone

Answer: 3-methyl-2-butanone

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