Which one of the following species is most stable

Options

A. `p - O_2 N - C_6H_4 - overset(+)CH_2`
B. `p - CH_3 O - C_6H_4 + overset+CH_2`
C. `p - Cl - C_6H_4 - overset(+)CH_2`
D. `C_6H_5 - overset(+)CH_2`

Answer

B

Explanation

Chlorine is also electron withdrawing but its effect is less than `-NO_2` group.
Hence, correct order of stability.

Methoxy group is electron releasing. Therefore increases stability by donating electron

Chlorine is also electron withdrawing but its effect is less than `-NO_2` group.
Hence, correct order of stability.