Which of the following reactions possess highest `Delta H` value

Options

A. `CH_3Br to CH_3^(+) + Br^(-)`
B. `CH_3CH_2Br to CH_3CH_3^+`
C. `CH_3 - undersetoverset(|)(CH_3)(C )H - Br to CH_3-CH^(+) - CH_3 +Br^-`
D. `(CH_3)_3 C - Br to (CH_3)_3 C^(+) + Br^(-)`

Answer

A

Explanation

Energy require by aryl halide that forms stable carbocation (when C-X bond breaks) is less than the aryl halide that forms less stable carbocation `""^(+)CH_3` is stable more `Delta H` is required