JEE Main Chemistry question

1,2-Dibromocyclohexane, on dehydrohalogenation (treatment with excess base), gives

(A)cyclohexene (single ring double bond)
(B)1,3-cyclohexadiene (ring with two conjugated double bonds)Correct
(C)benzene
(D)None of these

Answer: (B)

Solution

Treating the vicinal dibromide 1,2-dibromocyclohexane with excess strong base (e.g. ) brings about two successive dehydrohalogenation (E2) eliminations: the first removes one HBr to give a cyclohexenyl bromide (bromocyclohexene), and the second removes the remaining HBr

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Question ID VK-148118