Question

In which of the following the polymer is correctly matched with the catalyst used for its preparation? 
I. Teflon - Persulphate 
II. Low density polythene - Triethyl aluminium and titanium tetrachloride 
III. Terylene - Zinc acetate/antimony trioxide 

• A. I, III only
• B. I, II only
• C. II, III only
• D. I, II, III

Hint:

Remember the catalysts used in the preparation of common polymers.

Answer 1

The Correct Option is A

1. Teflon:

Teflon (polytetrafluoroethylene or PTFE) is made by the free radical polymerization of tetrafluoroethylene. Persulphate catalysts are used in the polymerization of tetrafluoroethylene to form Teflon. Thus, I is correct.

2. Low density polythene (LDPE):

LDPE is made by the free radical polymerization of ethylene under high pressure and in the presence of peroxide initiators. Triethyl aluminium and titanium tetrachloride (Ziegler-Natta catalyst) are used for the preparation of high-density polyethylene (HDPE), not LDPE. Thus, II is incorrect.

3. Terylene (Dacron):

Terylene is a polyester formed by the condensation polymerization of ethylene glycol and terephthalic acid. Zinc acetate/antimony trioxide is used as a catalyst in the preparation of Terylene. Thus, III is correct.

Therefore, the correctly matched sets are I and III.

Final Answer:
I, III only.