Chemistry - Hydrocarbon Question with Solution | TestHub

Addition of $HBr$ to an alkene proceeds via an electrophilic addition mechanism following Markovnikov's rule.

In 1-methylcyclohexene (first option), the double bond is between $C_1$ (bonded to a methyl group) and $C_2$.

Protonation by $H^{+}$ occurs at $C_2$ to generate a more stable tertiary carbocation at $C_1$.

The nucleophile $B{r}^{-}$ then attacks the tertiary carbocation at $C_1$ to form 1-bromo-1-methylcyclohexane as the major product.

Other given alkenes will form secondary carbocations initially, leading to different major products.

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