JEE Main · 2019 · 12 Apr 2019 · Shift 2 · Polymers

The correct name of the following polymer is:

(A)Polyisoprene
(B)Polytert-butylene
(C)Polyisobutane
(D)Polyisobutylene✓ Correct

Answer: (D)

Solution

The repeating unit, a backbone carbon bearing two methyl groups, is what addition polymerisation of isobutylene (2-methylpropene),

CH X_{2} = C (CH X_{3}) X_{2}

, produces. The saturated backbone rules out polyisoprene, and polyisobutane is not a real polymer since isobutane cannot polymerise, so the correct name is polyisobutylene.

JEE Main · 2019 · 12 Apr 2019 · Shift 2 · Single correct option

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