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ALDEHYDES, KETONES AND CARBOXYLIC ACID

28149 Which of the following is the weakest acid

1

2

C H_{3} C O O H

3

H C O O H

4

ALDEHYDES, KETONES AND CARBOXYLIC ACID

28150 Pyruvic acid is obtained by

1 Oxidation of acetaldehyde cyanohydrin

2 Oxidation of acetone cyanohydrin

3 Oxidation of formaldehyde cyanohydrin

4 None of these

Explanation:

(a) $C H_{3} - \underset{O}{\underset{| |}{C}} - H + H C N \to C H_{3} - {C_{|}^{|}}_{O H}^{C N} - H \overset{H_{2} O}{\to}$ $C H_{3} - \underset{O H}{\underset{|}{C H}} - C O O H \overset{[O]}{\to}$ $\underset{Pyruvic acid}{C H_{3} - \underset{O}{\underset{| |}{C}} - C O O H}$

ALDEHYDES, KETONES AND CARBOXYLIC ACID

28151 The product obtained by dry distillation of calcium formate on reacting with ammonia yields

1 Formamide

2 Acetamide

3 Acetaldehyde ammonia

4 Urotropine

Explanation:

(d) $\underset{Calcium formate}{2 {(H C O O)}_{2} C a} \overset{Dry distillation}{\to} \underset{Formaldehyde}{2 H C H O} + 2 C a C O_{3}$
$6 H C H O + 4 N H_{3} \to \underset{Urotropin}{{(C H_{2})}_{6} N_{4}} + 6 H_{2} O$

ALDEHYDES, KETONES AND CARBOXYLIC ACID

28152 In the reaction $C_{8} H_{6} O_{4} \overset{Δ}{\to} X \overset{N H_{3}}{\to}$ The compound $X$ is

1 Phthalic anhydride

2 Phthalic acid

3

o -

xylene

4 Benzoic acid

ALDEHYDES, KETONES AND CARBOXYLIC ACID

28149 Which of the following is the weakest acid

1

2

C H_{3} C O O H

3

H C O O H

4

ALDEHYDES, KETONES AND CARBOXYLIC ACID

28150 Pyruvic acid is obtained by

1 Oxidation of acetaldehyde cyanohydrin

2 Oxidation of acetone cyanohydrin

3 Oxidation of formaldehyde cyanohydrin

4 None of these

Explanation:

(a) $C H_{3} - \underset{O}{\underset{| |}{C}} - H + H C N \to C H_{3} - {C_{|}^{|}}_{O H}^{C N} - H \overset{H_{2} O}{\to}$ $C H_{3} - \underset{O H}{\underset{|}{C H}} - C O O H \overset{[O]}{\to}$ $\underset{Pyruvic acid}{C H_{3} - \underset{O}{\underset{| |}{C}} - C O O H}$

ALDEHYDES, KETONES AND CARBOXYLIC ACID

28151 The product obtained by dry distillation of calcium formate on reacting with ammonia yields

1 Formamide

2 Acetamide

3 Acetaldehyde ammonia

4 Urotropine

Explanation:

(d) $\underset{Calcium formate}{2 {(H C O O)}_{2} C a} \overset{Dry distillation}{\to} \underset{Formaldehyde}{2 H C H O} + 2 C a C O_{3}$
$6 H C H O + 4 N H_{3} \to \underset{Urotropin}{{(C H_{2})}_{6} N_{4}} + 6 H_{2} O$

ALDEHYDES, KETONES AND CARBOXYLIC ACID

28152 In the reaction $C_{8} H_{6} O_{4} \overset{Δ}{\to} X \overset{N H_{3}}{\to}$ The compound $X$ is

1 Phthalic anhydride

2 Phthalic acid

3

o -

xylene

4 Benzoic acid

ALDEHYDES, KETONES AND CARBOXYLIC ACID

28149 Which of the following is the weakest acid

1

2

C H_{3} C O O H

3

H C O O H

4

ALDEHYDES, KETONES AND CARBOXYLIC ACID

28150 Pyruvic acid is obtained by

1 Oxidation of acetaldehyde cyanohydrin

2 Oxidation of acetone cyanohydrin

3 Oxidation of formaldehyde cyanohydrin

4 None of these

Explanation:

(a) $C H_{3} - \underset{O}{\underset{| |}{C}} - H + H C N \to C H_{3} - {C_{|}^{|}}_{O H}^{C N} - H \overset{H_{2} O}{\to}$ $C H_{3} - \underset{O H}{\underset{|}{C H}} - C O O H \overset{[O]}{\to}$ $\underset{Pyruvic acid}{C H_{3} - \underset{O}{\underset{| |}{C}} - C O O H}$

ALDEHYDES, KETONES AND CARBOXYLIC ACID

28151 The product obtained by dry distillation of calcium formate on reacting with ammonia yields

1 Formamide

2 Acetamide

3 Acetaldehyde ammonia

4 Urotropine

Explanation:

(d) $\underset{Calcium formate}{2 {(H C O O)}_{2} C a} \overset{Dry distillation}{\to} \underset{Formaldehyde}{2 H C H O} + 2 C a C O_{3}$
$6 H C H O + 4 N H_{3} \to \underset{Urotropin}{{(C H_{2})}_{6} N_{4}} + 6 H_{2} O$

ALDEHYDES, KETONES AND CARBOXYLIC ACID

28152 In the reaction $C_{8} H_{6} O_{4} \overset{Δ}{\to} X \overset{N H_{3}}{\to}$ The compound $X$ is

1 Phthalic anhydride

2 Phthalic acid

3

o -

xylene

4 Benzoic acid

ALDEHYDES, KETONES AND CARBOXYLIC ACID

28149 Which of the following is the weakest acid

1

2

C H_{3} C O O H

3

H C O O H

4

ALDEHYDES, KETONES AND CARBOXYLIC ACID

28150 Pyruvic acid is obtained by

1 Oxidation of acetaldehyde cyanohydrin

2 Oxidation of acetone cyanohydrin

3 Oxidation of formaldehyde cyanohydrin

4 None of these

Explanation:

(a) $C H_{3} - \underset{O}{\underset{| |}{C}} - H + H C N \to C H_{3} - {C_{|}^{|}}_{O H}^{C N} - H \overset{H_{2} O}{\to}$ $C H_{3} - \underset{O H}{\underset{|}{C H}} - C O O H \overset{[O]}{\to}$ $\underset{Pyruvic acid}{C H_{3} - \underset{O}{\underset{| |}{C}} - C O O H}$

ALDEHYDES, KETONES AND CARBOXYLIC ACID

28151 The product obtained by dry distillation of calcium formate on reacting with ammonia yields

1 Formamide

2 Acetamide

3 Acetaldehyde ammonia

4 Urotropine

Explanation:

(d) $\underset{Calcium formate}{2 {(H C O O)}_{2} C a} \overset{Dry distillation}{\to} \underset{Formaldehyde}{2 H C H O} + 2 C a C O_{3}$
$6 H C H O + 4 N H_{3} \to \underset{Urotropin}{{(C H_{2})}_{6} N_{4}} + 6 H_{2} O$

ALDEHYDES, KETONES AND CARBOXYLIC ACID

28152 In the reaction $C_{8} H_{6} O_{4} \overset{Δ}{\to} X \overset{N H_{3}}{\to}$ The compound $X$ is

1 Phthalic anhydride

2 Phthalic acid

3

o -

xylene

4 Benzoic acid