Question

$1$-Methylcyclohexene on treatment with $HCl$ gives:

• A. $1$-Chloro-$2$-methylcyclohexane.
• B. $1$-Chloro-$1$-methylcyclohexane.
• C. $1$-Chloro-cyclohexane
• D. none of these

Answer 1

The correct option is B $1$-Chloro-$1$-methylcyclohexane.

$1$-Methylcyclohexene on treatment with $HCl$ gives $1$-Chloro-$1$-methylcyclohexane. A molecule of $HCl$ is added to carbon carbon double bond.
Note:
The addition of hydrogen halides to unsymmetrical alkene takes place according to Markovonikov's rule.
When an unsymmetrical reagent adds to an unsymmetrical alkene, the negative part of the reagent gets attached to that unsaturated carbon atom which caries lesser number of hydrogen atoms.