PDI for natural polymers is generally close to:

(1) zero                             

(2) 100

(3) 1                                   

(4) 10

The catalyst used in the manufacture of polythene by the Ziegler method is:

1. titanium tetrachloride and triphenyl aluminum

2. titanium tetrachloride and triethyl aluminium

3. titanium dioxide

4. titanium isopropoxide

 Which of the following is a step-growth polymer?

1. Bakelite

2. Polyethylene

3. Teflon

4. PVC

The initial reaction in the formation of bakelite is an example of:

(1) Aromatic electrophilic substitution.

(2) Aromatic nucleophilic substitution.

(3) Free radical reaction.

(4) Aldol reaction.

PMMA is the polymer of.

1. methylmethacrylate

2. methylacrylate

3. methacrylate

4. ethylacrylate

Condensation of caprolactam gives:

1. nylon-6,6               
2. nylon-6
3. nitrile rubber
4. nylon-6,10
 

Natural rubber has

1. All trans-configuration.

2. Alternate cis - and trans-configuration.

3. Random cis - and trans-configuration.

4. All cis-configuration.

Biodegradable polymer which can be produced from glycine and aminocaproic acid is

1. Nylon- 2 - Nylon - 6

2. PHBV

3. Buna-N

4. Nylon-6, 6

Caprolactam is used for the manufacture of-

1. Nylon-6
2. Polythene
3. Terylene
4. Nylon-6 6

Dacron is a polymer of : 

1. Propylene and para HO—(C₆H₄)—OH

2. Benzoic acid and ethanol

3. Terephthalic acid and ethylene glycol

4. Benzoic acid and para HO—(C₆H₄)—OH