1.

Which of the following reactions possess highest Delta Hvalue

Answer»

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

Solution :ENERGY REQUIRE by aryl halide that forms stable carbocation (when C-X bond BREAKS) is less thanthe aryl halide that forms less stable carbocation `""^(+)CH_3`is stable more `Delta H`is required


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