Q97 · CSIR-NET Chemistry, December 2014
Paper: CSIR-NET December 2014 · Subject: Physical Chemistry · Chapter: Polymer Chemistry · Topic: Polymerisation Kinetics · Marks: 2 · Difficulty: Medium
The fraction of groups condensed at time in any stepwise condensation polymerization (overall second order) reaction is
(a)$1+\mathrm{kt}[\mathrm{A}]_{0}$
(b)$1 / 1+\mathrm{kt}[\mathrm{A}]_{0}$
(c)$\mathrm{kt}[\mathrm{A}]_{0} / 1+\mathrm{kt}[\mathrm{A}]_{0}$
(d)$1+\mathrm{kt}[\mathrm{A}]_{0} / \mathrm{kt}[\mathrm{A}]_{0}$
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
Second-order step growth: 1/[A] − 1/[A]₀ = kt ⇒ fraction reacted p = 1 − [A]/[A]₀ = kt[A]₀/(1 + kt[A]₀).
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