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Question:

Write the structure of the alkene formed by dehydrohalogenation of 1-bromo-1-methylcyclohexane with alcoholic KOH.

Solution:

1-methylcyclohex-1-ene is formed by dehydrohalogenation of 1-bromo-1-methylcyclohexane with alcoholic KOH. If there is possibility of formation of more than one alkene, then the major product is identified by Zaitsev's rule. According to Zaitsev's rule, during dehydrohalogenation, the more substituted alkene is the major product.