Alkyl Halides - Result Question 55

55. The total number of alkenes possible by dehydrobromination of $3$-bromo-$3$-cyclopentylhexane using alcoholic $KOH$ is

(2011)

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Answer:

Correct Answer: 55. $(5)$

Solution:

  1. The substrate has three different types of $B-H$, therefore, first three structural isomers of alkenes are expected as :

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The last two alkenes II and III are also capable of showing geometrical isomerism, hence two geometrical isomers for each of them will be counted giving a total of five isomers.