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POLYMERS

19431 Which is not a polymer

1 Sucrose

2 Enzyme

3 Starch

4 Teflon

Explanation:

(a) Sucrose is a disaccharides which upon acid or enzymatic hydrolysis gives only two molecules of monosaccharides.
Sucrose $\overset{H^{+} or invertaase}{\to}$ $D$ $(+)$ - glucose + $(D)$ $(-)$ - fructos

POLYMERS

19432 Which of the following is a syndiotactic polymer in $- [C H_{2} - C (Y Z) -]_{n}$

1 All

Y

groups lie on one side of the chain and all

Z

groups on the other side

2 The

Y

and

Z

groups lie alternately on each side of the chain

3 The

Y

and

Z

groups are arranged in a random fashion

4

Y

and

Z

groups are same

Explanation:

(b) There are $3$ stereo chemical arrangements are possible
$(i)$ Isotactic ( Same order) :- Here groups are arranged on one side of the chain. All $Y$ groups lie on one side and all $Z$ groups on the opposite side of the chain.
$(i i)$ Syndiotactic ( Alternating order ) :- The $Y$ and $Z$ groups lie alternately on each side of the chain.
$(i i i)$ Atactic ( Random order ) :- The $Y$ and $Z$ groups are arranged in a random fashion. 371-s1

POLYMERS

19433 Polymers of the type $Z - M n - Y$ , $i . e .$ those which contain a foreign molecule in addition to the recurring unit are known as

1 Semisynthetic polymers

2 Atactic polymers

3 Telomers

4 Plasticiser

Explanation:

Polymers of the type $Z - M_{n} - Y$ , those which contain a foreign molecule in addition to the recurring unit are known as telomers and the process of their formation is called telomerisation.

POLYMERS

19434 In the natural rubber ‘Caoutchouc’, the isoprene units are joined by

1 Head-to-head

2 Tail-to-tail

3 Head-to-tail

4 All of these

Explanation:

(c) $\overset{H e a d}{C H_{2}} = \underset{C H_{3}}{\underset{|}{C -}} C H = \overset{T a i l}{C H_{2}} + \overset{H e a d}{C H_{2}} = \underset{C H_{3}}{\underset{|}{C - C H}} = \overset{T a i l}{C H_{2}} \to$
$- (C H_{2} - \underset{C H_{2}}{\underset{|}{C =} C H} - C H_{2} - C H_{2} - \underset{C H_{3}}{\underset{|}{C =} C H} - C H_{2} -)_{n}$
From steric effects, the polymer formed has head to tail configuration.

POLYMERS

19431 Which is not a polymer

1 Sucrose

2 Enzyme

3 Starch

4 Teflon

Explanation:

(a) Sucrose is a disaccharides which upon acid or enzymatic hydrolysis gives only two molecules of monosaccharides.
Sucrose $\overset{H^{+} or invertaase}{\to}$ $D$ $(+)$ - glucose + $(D)$ $(-)$ - fructos

POLYMERS

19432 Which of the following is a syndiotactic polymer in $- [C H_{2} - C (Y Z) -]_{n}$

1 All

Y

groups lie on one side of the chain and all

Z

groups on the other side

2 The

Y

and

Z

groups lie alternately on each side of the chain

3 The

Y

and

Z

groups are arranged in a random fashion

4

Y

and

Z

groups are same

Explanation:

(b) There are $3$ stereo chemical arrangements are possible
$(i)$ Isotactic ( Same order) :- Here groups are arranged on one side of the chain. All $Y$ groups lie on one side and all $Z$ groups on the opposite side of the chain.
$(i i)$ Syndiotactic ( Alternating order ) :- The $Y$ and $Z$ groups lie alternately on each side of the chain.
$(i i i)$ Atactic ( Random order ) :- The $Y$ and $Z$ groups are arranged in a random fashion. 371-s1

POLYMERS

19433 Polymers of the type $Z - M n - Y$ , $i . e .$ those which contain a foreign molecule in addition to the recurring unit are known as

1 Semisynthetic polymers

2 Atactic polymers

3 Telomers

4 Plasticiser

Explanation:

Polymers of the type $Z - M_{n} - Y$ , those which contain a foreign molecule in addition to the recurring unit are known as telomers and the process of their formation is called telomerisation.

POLYMERS

19434 In the natural rubber ‘Caoutchouc’, the isoprene units are joined by

1 Head-to-head

2 Tail-to-tail

3 Head-to-tail

4 All of these

Explanation:

(c) $\overset{H e a d}{C H_{2}} = \underset{C H_{3}}{\underset{|}{C -}} C H = \overset{T a i l}{C H_{2}} + \overset{H e a d}{C H_{2}} = \underset{C H_{3}}{\underset{|}{C - C H}} = \overset{T a i l}{C H_{2}} \to$
$- (C H_{2} - \underset{C H_{2}}{\underset{|}{C =} C H} - C H_{2} - C H_{2} - \underset{C H_{3}}{\underset{|}{C =} C H} - C H_{2} -)_{n}$
From steric effects, the polymer formed has head to tail configuration.

POLYMERS

19431 Which is not a polymer

1 Sucrose

2 Enzyme

3 Starch

4 Teflon

Explanation:

(a) Sucrose is a disaccharides which upon acid or enzymatic hydrolysis gives only two molecules of monosaccharides.
Sucrose $\overset{H^{+} or invertaase}{\to}$ $D$ $(+)$ - glucose + $(D)$ $(-)$ - fructos

POLYMERS

19432 Which of the following is a syndiotactic polymer in $- [C H_{2} - C (Y Z) -]_{n}$

1 All

Y

groups lie on one side of the chain and all

Z

groups on the other side

2 The

Y

and

Z

groups lie alternately on each side of the chain

3 The

Y

and

Z

groups are arranged in a random fashion

4

Y

and

Z

groups are same

Explanation:

(b) There are $3$ stereo chemical arrangements are possible
$(i)$ Isotactic ( Same order) :- Here groups are arranged on one side of the chain. All $Y$ groups lie on one side and all $Z$ groups on the opposite side of the chain.
$(i i)$ Syndiotactic ( Alternating order ) :- The $Y$ and $Z$ groups lie alternately on each side of the chain.
$(i i i)$ Atactic ( Random order ) :- The $Y$ and $Z$ groups are arranged in a random fashion. 371-s1

POLYMERS

19433 Polymers of the type $Z - M n - Y$ , $i . e .$ those which contain a foreign molecule in addition to the recurring unit are known as

1 Semisynthetic polymers

2 Atactic polymers

3 Telomers

4 Plasticiser

Explanation:

Polymers of the type $Z - M_{n} - Y$ , those which contain a foreign molecule in addition to the recurring unit are known as telomers and the process of their formation is called telomerisation.

POLYMERS

19434 In the natural rubber ‘Caoutchouc’, the isoprene units are joined by

1 Head-to-head

2 Tail-to-tail

3 Head-to-tail

4 All of these

Explanation:

(c) $\overset{H e a d}{C H_{2}} = \underset{C H_{3}}{\underset{|}{C -}} C H = \overset{T a i l}{C H_{2}} + \overset{H e a d}{C H_{2}} = \underset{C H_{3}}{\underset{|}{C - C H}} = \overset{T a i l}{C H_{2}} \to$
$- (C H_{2} - \underset{C H_{2}}{\underset{|}{C =} C H} - C H_{2} - C H_{2} - \underset{C H_{3}}{\underset{|}{C =} C H} - C H_{2} -)_{n}$
From steric effects, the polymer formed has head to tail configuration.

POLYMERS

19431 Which is not a polymer

1 Sucrose

2 Enzyme

3 Starch

4 Teflon

Explanation:

(a) Sucrose is a disaccharides which upon acid or enzymatic hydrolysis gives only two molecules of monosaccharides.
Sucrose $\overset{H^{+} or invertaase}{\to}$ $D$ $(+)$ - glucose + $(D)$ $(-)$ - fructos

POLYMERS

19432 Which of the following is a syndiotactic polymer in $- [C H_{2} - C (Y Z) -]_{n}$

1 All

Y

groups lie on one side of the chain and all

Z

groups on the other side

2 The

Y

and

Z

groups lie alternately on each side of the chain

3 The

Y

and

Z

groups are arranged in a random fashion

4

Y

and

Z

groups are same

Explanation:

(b) There are $3$ stereo chemical arrangements are possible
$(i)$ Isotactic ( Same order) :- Here groups are arranged on one side of the chain. All $Y$ groups lie on one side and all $Z$ groups on the opposite side of the chain.
$(i i)$ Syndiotactic ( Alternating order ) :- The $Y$ and $Z$ groups lie alternately on each side of the chain.
$(i i i)$ Atactic ( Random order ) :- The $Y$ and $Z$ groups are arranged in a random fashion. 371-s1

POLYMERS

19433 Polymers of the type $Z - M n - Y$ , $i . e .$ those which contain a foreign molecule in addition to the recurring unit are known as

1 Semisynthetic polymers

2 Atactic polymers

3 Telomers

4 Plasticiser

Explanation:

Polymers of the type $Z - M_{n} - Y$ , those which contain a foreign molecule in addition to the recurring unit are known as telomers and the process of their formation is called telomerisation.

POLYMERS

19434 In the natural rubber ‘Caoutchouc’, the isoprene units are joined by

1 Head-to-head

2 Tail-to-tail

3 Head-to-tail

4 All of these

Explanation:

(c) $\overset{H e a d}{C H_{2}} = \underset{C H_{3}}{\underset{|}{C -}} C H = \overset{T a i l}{C H_{2}} + \overset{H e a d}{C H_{2}} = \underset{C H_{3}}{\underset{|}{C - C H}} = \overset{T a i l}{C H_{2}} \to$
$- (C H_{2} - \underset{C H_{2}}{\underset{|}{C =} C H} - C H_{2} - C H_{2} - \underset{C H_{3}}{\underset{|}{C =} C H} - C H_{2} -)_{n}$
From steric effects, the polymer formed has head to tail configuration.

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