Question

Which of the following is not a semi-synthetic polymer?

• A. Cis-polyisoprene
• B. Cellulose nitrate
• C. Cellulose acetate
• D. Vulcanised rubber

Hint:

Semi-synthetic polymers are derived from natural sources but chemically modified for enhanced properties.

Answer 1

The Correct Option is A

Step 1: Understanding Semi-Synthetic Polymers
Semi-synthetic polymers are derived by chemically modifying natural polymers.
Examples include cellulose derivatives and modified rubber.
Step 2: Classification of Given Options
Cis-polyisoprene is natural rubber, not a semi-synthetic polymer.
Cellulose nitrate and Cellulose acetate are modified cellulose derivatives.
Vulcanized rubber is chemically treated natural rubber, making it semi-synthetic.
Final Answer: Since cis-polyisoprene is natural rubber, the correct answer is (A).

Answer 2

Cis-polyisoprene is NOT a semi-synthetic polymer.

Cis-polyisoprene is a natural polymer primarily found in natural rubber. It is obtained directly from the latex of rubber trees (Hevea brasiliensis) and is known for its excellent elasticity and resilience. Being a naturally occurring polymer, it does not undergo any chemical modification or derivatization to be used in its typical form.

On the other hand, semi-synthetic polymers are derived from natural polymers through chemical modifications. Examples include cellulose acetate and vulcanized rubber, where the natural polymer has been chemically altered to improve certain properties.

Therefore, since cis-polyisoprene is a pure natural polymer without chemical modification, it is not classified as a semi-synthetic polymer.