Question

Which of the following is likely to undergo racemization during alkaline hydrolysis?

• A.

  

• B. $(\text{CH}_3)_3\text{C}-\text{CH}_2-\text{Cl}$
• C.

  

• D.

  

Hint:

To spot a racemization candidate instantly, look for an asymmetric carbon atom positioned right next to a benzene ring (a chiral benzylic site). The resonance stabilization forces an $\text{S}_\text{N}1$ pathway, which always leads to racemization.

Answer 1

The Correct Option is D

Step 1: Understanding the Question:
The question asks to pick the copolymer from a list of common polymers.

Step 2: Key Formula or Approach:
A copolymer is formed from two or more different monomeric species, unlike a homopolymer which is derived from a single type of monomer.

Step 3: Detailed Explanation:
PVC, Nylon-6, and Polyethylene are all homopolymers, each made from only one type of monomer. Buna-S is synthesized from the copolymerization of two distinct monomers, 1,3-butadiene and styrene.

Step 4: Final Answer:
The copolymer is Buna-S, matching option (C).