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ALDEHYDES, KETONES AND CARBOXYLIC ACID

28038 What is the main reason for the fact that carboxylic acids can undergo ionization

1 Absence of

α -

hydrogen

2 Resonance stabilisation of the carboxylate ion

3 High reactivity of

α -

hydrogen

4 Hydrogen bonding

Explanation:

Carboxylate acids are easily ionized because there is resonance in carbroxylate ion due to $π$ - electron shifting so $H^{+}$ get ionised very easily.

ALDEHYDES, KETONES AND CARBOXYLIC ACID

28039 Which of the following compounds will evolve hydrogen on treatment with metal

1

C_{2} H_{5} O H

2

C H_{3} C O O H

3

(a)

and

(b)

both

4 None of these

Explanation:

(c) $2 C_{2} H_{5} O H + 2 N a \to 2 C_{2} H_{5} O N a + H_{2}$
$2 C H_{3} C O O H + 2 N a \to 2 C H_{3} C O O N a + H_{2}$

ALDEHYDES, KETONES AND CARBOXYLIC ACID

28040 When urea is heated, it forms biurette, alkaline solution of which forms ..... with $C u S O_{4}$ solution

1 Violet colour

2 Red colour

3 Green colour

4 Black colour

ALDEHYDES, KETONES AND CARBOXYLIC ACID

28041 Which of the following would be expected to be most highly ionised in water

1

C H_{2} C l C H_{2} C H_{2} C O O H

2

C H_{3} C H C l . C H_{2} . C O O H

3

C H_{3} . C H_{2} . C C l_{2} . C O O H

4

C H_{3} . C H_{2} . C H C l . C O O H

Explanation:

$C H_{3} - C H_{2} - C C l_{2} - C O O H$ ;
$α$ , $α$ - dichloro butanoic acid is most acidic.
Hence it will easily loose $H^{+}$ ions in solution.

ALDEHYDES, KETONES AND CARBOXYLIC ACID

28038 What is the main reason for the fact that carboxylic acids can undergo ionization

1 Absence of

α -

hydrogen

2 Resonance stabilisation of the carboxylate ion

3 High reactivity of

α -

hydrogen

4 Hydrogen bonding

Explanation:

Carboxylate acids are easily ionized because there is resonance in carbroxylate ion due to $π$ - electron shifting so $H^{+}$ get ionised very easily.

ALDEHYDES, KETONES AND CARBOXYLIC ACID

28039 Which of the following compounds will evolve hydrogen on treatment with metal

1

C_{2} H_{5} O H

2

C H_{3} C O O H

3

(a)

and

(b)

both

4 None of these

Explanation:

(c) $2 C_{2} H_{5} O H + 2 N a \to 2 C_{2} H_{5} O N a + H_{2}$
$2 C H_{3} C O O H + 2 N a \to 2 C H_{3} C O O N a + H_{2}$

ALDEHYDES, KETONES AND CARBOXYLIC ACID

28040 When urea is heated, it forms biurette, alkaline solution of which forms ..... with $C u S O_{4}$ solution

1 Violet colour

2 Red colour

3 Green colour

4 Black colour

ALDEHYDES, KETONES AND CARBOXYLIC ACID

28041 Which of the following would be expected to be most highly ionised in water

1

C H_{2} C l C H_{2} C H_{2} C O O H

2

C H_{3} C H C l . C H_{2} . C O O H

3

C H_{3} . C H_{2} . C C l_{2} . C O O H

4

C H_{3} . C H_{2} . C H C l . C O O H

Explanation:

$C H_{3} - C H_{2} - C C l_{2} - C O O H$ ;
$α$ , $α$ - dichloro butanoic acid is most acidic.
Hence it will easily loose $H^{+}$ ions in solution.

ALDEHYDES, KETONES AND CARBOXYLIC ACID

28038 What is the main reason for the fact that carboxylic acids can undergo ionization

1 Absence of

α -

hydrogen

2 Resonance stabilisation of the carboxylate ion

3 High reactivity of

α -

hydrogen

4 Hydrogen bonding

Explanation:

Carboxylate acids are easily ionized because there is resonance in carbroxylate ion due to $π$ - electron shifting so $H^{+}$ get ionised very easily.

ALDEHYDES, KETONES AND CARBOXYLIC ACID

28039 Which of the following compounds will evolve hydrogen on treatment with metal

1

C_{2} H_{5} O H

2

C H_{3} C O O H

3

(a)

and

(b)

both

4 None of these

Explanation:

(c) $2 C_{2} H_{5} O H + 2 N a \to 2 C_{2} H_{5} O N a + H_{2}$
$2 C H_{3} C O O H + 2 N a \to 2 C H_{3} C O O N a + H_{2}$

ALDEHYDES, KETONES AND CARBOXYLIC ACID

28040 When urea is heated, it forms biurette, alkaline solution of which forms ..... with $C u S O_{4}$ solution

1 Violet colour

2 Red colour

3 Green colour

4 Black colour

ALDEHYDES, KETONES AND CARBOXYLIC ACID

28041 Which of the following would be expected to be most highly ionised in water

1

C H_{2} C l C H_{2} C H_{2} C O O H

2

C H_{3} C H C l . C H_{2} . C O O H

3

C H_{3} . C H_{2} . C C l_{2} . C O O H

4

C H_{3} . C H_{2} . C H C l . C O O H

Explanation:

$C H_{3} - C H_{2} - C C l_{2} - C O O H$ ;
$α$ , $α$ - dichloro butanoic acid is most acidic.
Hence it will easily loose $H^{+}$ ions in solution.

ALDEHYDES, KETONES AND CARBOXYLIC ACID

28038 What is the main reason for the fact that carboxylic acids can undergo ionization

1 Absence of

α -

hydrogen

2 Resonance stabilisation of the carboxylate ion

3 High reactivity of

α -

hydrogen

4 Hydrogen bonding

Explanation:

Carboxylate acids are easily ionized because there is resonance in carbroxylate ion due to $π$ - electron shifting so $H^{+}$ get ionised very easily.

ALDEHYDES, KETONES AND CARBOXYLIC ACID

28039 Which of the following compounds will evolve hydrogen on treatment with metal

1

C_{2} H_{5} O H

2

C H_{3} C O O H

3

(a)

and

(b)

both

4 None of these

Explanation:

(c) $2 C_{2} H_{5} O H + 2 N a \to 2 C_{2} H_{5} O N a + H_{2}$
$2 C H_{3} C O O H + 2 N a \to 2 C H_{3} C O O N a + H_{2}$

ALDEHYDES, KETONES AND CARBOXYLIC ACID

28040 When urea is heated, it forms biurette, alkaline solution of which forms ..... with $C u S O_{4}$ solution

1 Violet colour

2 Red colour

3 Green colour

4 Black colour

ALDEHYDES, KETONES AND CARBOXYLIC ACID

28041 Which of the following would be expected to be most highly ionised in water

1

C H_{2} C l C H_{2} C H_{2} C O O H

2

C H_{3} C H C l . C H_{2} . C O O H

3

C H_{3} . C H_{2} . C C l_{2} . C O O H

4

C H_{3} . C H_{2} . C H C l . C O O H

Explanation:

$C H_{3} - C H_{2} - C C l_{2} - C O O H$ ;
$α$ , $α$ - dichloro butanoic acid is most acidic.
Hence it will easily loose $H^{+}$ ions in solution.