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

Questions

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

A primary alcohol

B secondary alcohol

C tertiary alcohol

D All of these

View Answer

Answer:secondary alcohol

2 Consider the following transformations
CH3COOH

The molecular formula of C is

B ICH₂-COCH₃

C CHI₃

D CH₃I

View Answer

Answer:ICH₂-COCH₃

3 A and B in the following reactions are

View Answer

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

View Answer

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

View Answer

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

View Answer

Answer:Clemmenson reduction

7 Aldol condensation will not take place in

A HCHO

B CH₃CHO

C CH₃COCH₃

D CH₃CH₂CHO

View Answer

Answer:HCHO

In the above reaction product, 'P' is

View Answer

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

View Answer

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

View Answer

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

View Answer

Answer:barbituric acid

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

A Aldehyde

B Ketone

C Alkene

D Acid

View Answer

Answer: Aldehyde

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

A CH₃COOCH₃

B CH₃COOC₂H₅

C CH₃COCH₃

D CH₃CHO

View Answer

Answer:CH₃COOCH₃

14 HCHO and HCOOH are distinguished by treating with:

A Tollens reagent

B NaHCO₃

C Fehling's Solution

D Benedict Solution

View Answer

Answer:NaHCO₃

15 Lacrymator or tear gas is:

A C₆H₅COCl

B C₆H₅OC₆H₅

C C₆H₅COCH₂Cl

D C₆H₅COCH₃

View Answer

Answer:C₆H₅COCH₂Cl

16 Formaldehyde can be distinguished from acetaldehyde by:

A Fehling's solution

B Schiff's reagent

C Ammonia

D Ammoniacal AgNO₃

View Answer

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)

View Answer

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

View Answer

Answer: NaOH

19 Genrally Aldehydes behave as:

A oxidising agent

B reducing agent

C dehydration agent

D oxidizing as well as reducing agent

View Answer

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

View Answer

Answer: a ketone

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