MHT CET · Chemistry · Polymers

Which from following polymers is obtained by ring opening polymerization method?

B \(\left[\mathrm{NH}-\left(\mathrm{CH}_2\right)_5-\mathrm{CO}\right]_{\mathrm{n}}\)
C \(\left[\mathrm{CH}_2-\mathrm{CH}_2\right]_{\mathrm{n}}\)

Verified Solution

Answer & Solution

Correct Answer

(B) \(\left[\mathrm{NH}-\left(\mathrm{CH}_2\right)_5-\mathrm{CO}\right]_{\mathrm{n}}\)

Step-by-step Solution

Detailed explanation

Ring opening polymerisation involves addition of monomers (cyclic compounds) to growing chain molecules without elimination of small molecules like \(\mathrm{H}_2 \mathrm{O}, \mathrm{CH}_3 \mathrm{OH}\), etc.
E.g. \(\varepsilon\)-caprolactum.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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