Which of the following will be most stable diazonium salt `RN_2^(+)X^(-)`?

Options

A. `C_6H_5N_(2)^(+)X^(-)`
B. `CH_3CH_2N_(2)^(+)X^(-)`
C. `C_6H_5CH_(2)N_(2)^(+)H^(-)`
D. `CH_3N_(2)^(+)X^(-)`

Answer

A

Explanation

Diazonium salt is most stabilised as the (-) charge on halogen is resonance stabilised .
In the rest options, stabilisation is only because of +R & +I effect.