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

(1) Which one of the following on oxidation gives a ketone?

[A] primary alcohol

[B] secondary alcohol

[C] tertiary alcohol

[D] All of these

Answer: secondary alcohol

(2) Consider the following transformations
CH3COOHThe molecular formula of C is

[A]

[B] ICH₂-COCH₃

[C] CHI₃

[D] CH₃I

Answer: ICH₂-COCH₃

(3) A and B in the following reactions are

[A]

[B]

[C]

[D]

Answer:

(4) The product formed in aldol condensation is

[A] a beta-hydroxy acid

[B] a beta-hydroxy aldehyde or a beta-hydroxy ketone

[C] an alpha-hydroxy aldehyde or ketone

[D] an alpha, beta unsaturated ester

Answer: a beta-hydroxy aldehyde or a beta-hydroxy ketone

(5) Consider the following reaction,

The product Z is

[A] toluene

[B] benzaldehyde

[C] benzoic acid

[D] benzene

Answer: benzoic acid

(6) Reduction of aldehydes and ketones into hydrocarbons using zinc amalgam and conc. HCl is called

[A] Clemmenson reduction

[B] Cope reduction

[C] Dow reduction

[D] Wolff-Kishner reduction

Answer: Clemmenson reduction

(7) Aldol condensation will not take place in

[A] HCHO

[B] CH₃CHO

[C] CH₃COCH₃

[D] CH₃CH₂CHO

Answer: HCHO

(8)

In the above reaction product, 'P' is

[A]

[B]

[C]

[D]

Answer:

(9) The -OH group of an alcohol or the -COOH group of a carboxylic acid can be replaced by -Cl using

[A] phosphorus pentachloride

[B] hypochlorous acid

[C] chlorine

[D] hydrochloric acid

Answer: phosphorus pentachloride

(10) An ester is boiled with KOH. The product is cooled and acidified with conc. HCl. A white crystalline acid separates. The ester is

[A] methyl acetate

[B] ethyl acetate

[C] ethyl formate

[D] ethyl benzoate

Answer: ethyl benzoate

(11) The compound formed when malonic acid heated with urea, is

[A] cinnamic acid

[B] butyric acid

[C] barbituric acid

[D] crotonic acid

Answer: barbituric acid

(12) What is formed when a primary alcohol undergoes catalytic dehydrogenation?

[A] Aldehyde

[B] Ketone

[C] Alkene

[D] Acid

Answer: Aldehyde

(13) The compound which on reduction with LiAlH₄ gives two diffrent alcohols:

[A] CH₃COOCH₃

[B] CH₃COOC₂H₅

[C] CH₃COCH₃

[D] CH₃CHO

Answer: CH₃COOCH₃

(14) HCHO and HCOOH are distinguished by treating with:

[A] Tollens reagent

[B] NaHCO₃

[C] Fehling's Solution

[D] Benedict Solution

Answer: NaHCO₃

(15) Lacrymator or tear gas is:

[A] C₆H₅COCl

[B] C₆H₅OC₆H₅

[C] C₆H₅COCH₂Cl

[D] C₆H₅COCH₃

Answer: C₆H₅COCH₂Cl

(16) Formaldehyde can be distinguished from acetaldehyde by:

[A] Fehling's solution

[B] Schiff's reagent

[C] Ammonia

[D] Ammoniacal AgNO₃

Answer: Ammonia

(17) The correct acidity order of the following is:

[A] (III)>(IV)>(II)>(I)

[B] (IV)>(III)>(I)>(II)

[C] (III)>(II)>(I)>(IV)

[D] (II)>(III)>(IV)>(I)

Answer: (III)>(IV)>(II)>(I)

(18) Acetone reacts with iodine (I₂) to form iodoform in the presence of

[A] CaCO₃

[B] NaOH

[C] KOH

[D] MgCO₃

Answer: NaOH

(19) Genrally Aldehydes behave as:

[A] oxidising agent

[B] reducing agent

[C] dehydration agent

[D] oxidizing as well as reducing agent

Answer: reducing agent

(20) Compound (A) C₅H₁₀O forms a phenyl hydrazone and gives negative Tollen's and iodoform tests. Compound (A) on reduction gives n-pentane. Compound (A) is:

[A] a primary alcohol

[B] an aldehyde

[C] a ketone

[D] a secondary alcohol

Answer: a ketone

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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 Objective Type Questions and Answers

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