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Hydrocarbons

Question
CBSEENCH11007687

Which one of the following do not exhibit geometrical isomerism?
(i) Pentene-1         (ii) Butene-2
(iii) Isobutylene     (iv) 3, 4-Dimethyl- 3-hexene.

Solution
(i) Pentene-1 and  (iii) Isobutylene do not exhibit geometrical isomerism.