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In the reaction with HCl, an alkene reacts in accordance with the Markovnikov's rule, to give a product 1-chloro-1-methylcyclohexane. The possible alkene is:
A
- 
B
- 
C
(A) and (B)
D
- 
Detailed Solution
Methylenecyclohexane + $H^+$ → 1-methylcyclohexyl (tertiary) carbocation → + $Cl^-$ → 1-chloro-1-methylcyclohexane.
1-Methylcyclohexene + $H^+$ → the same tertiary carbocation → + $Cl^-$ → 1-chloro-1-methylcyclohexane.
So both (A) and (B) give the product.
1-Methylcyclohexene + $H^+$ → the same tertiary carbocation → + $Cl^-$ → 1-chloro-1-methylcyclohexane.
So both (A) and (B) give the product.