The product formed when
1,2-Dimethylcyclohexene is treated with $H B r$ is:

cis-1-Bromo-1,2-dimethylcyclohexene

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trans-1-Bromo-1,2-dimethylcyclohexene

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1-Bromo-1,2-dimethylcyclohexene - both cis and trans isomers

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1,2-Dibromomethylcyclohexane

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Solution

The correct option is C 1-Bromo-1,2-dimethylcyclohexene - both cis and trans isomers
Addition of HBr takes place via carbocation intermediate formation
$B r^{-}$ can connect to carbocation which is planar on either side. So, two product are formed. A mixture of cis and trans isomers is formed.

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