Question

Which of the following you expect to be crystalline polymer

• A. Polybutadiene
• B. Nylon 66
• C. Cis polyisoprene
• D. Polychloroprene

Hint:

Strong intermolecular forces like hydrogen bonding promote polymer crystallinity.

Answer 1

The Correct Option is B

Step 1: Understanding crystallinity in polymers.
Crystalline polymers have regularly arranged chains that pack closely, leading to ordered regions. Strong intermolecular forces favor crystallinity.
Step 2: Structure of Nylon 66.
Nylon 66 contains repeating amide groups (–CONH–) that form strong hydrogen bonds between polymer chains, allowing them to align and crystallize efficiently.
Step 3: Analysis of options.
(A) Polybutadiene: Mostly amorphous elastomer.
(B) Nylon 66: Correct — Highly crystalline due to hydrogen bonding.
(C) Cis polyisoprene: Natural rubber, largely amorphous.
(D) Polychloroprene: Elastomer with low crystallinity.
Step 4: Conclusion.
Nylon 66 is expected to be a crystalline polymer, hence option (B) is correct.