Question

Which from following polymers is classified as branched chain polymer?

• A. High density polythene
• B. Low density polythene
• C. PVC
• D. Melamine

Hint:

LDPE is made by high pressure free radical polymerisation, which gives branched chains.

Answer 1

The Correct Option is B

Step 1: Understand the concept
Polymers can be linear, branched or cross-linked in structure, depending on how the chains are connected.

Step 2: Branched example
Low density polythene (LDPE) is prepared at high pressure and high temperature by free radical polymerisation. Chain transfer creates side branches, so the chains pack loosely and the density is low.

Step 3: Check the others
High density polythene is made with Ziegler-Natta catalyst and has linear chains. PVC has linear chains. Melamine polymer has a cross-linked three dimensional network.

Step 4: Conclusion
LDPE is classified as a branched chain polymer.

Final Answer:
Low density polythene has branched chains. This is option (B). \[ \boxed{\text{(B) }\text{Low density polythene}} \]