Which is least reactive towards nucleophilic substitution `(S_(N^(2)))`

Options

A. `CH_(2) = CH - CH_(2)Cl`
B. `CH_(3) - overset(CH_(3)) overset(|)underset(CH_(3))underset(|)( C) - Cl`
C.
D. `CH_(3) - CH(Cl) CH_(3)`

Answer

C

Explanation

Chlorobenzene can undergo nucleophilic substitution under a drastic condition because due to resonance C-Cl bond acquire double bond character as a result substitution of -Cl by nucleophile become difficult