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Question

Conjugation of electron withdrawing groups, e.g., CHO,O||CR,O||COR,CN,NO2 activates nucleophilic attack in halobenzene. The order of reactivity of these groups is:

A
NO2>CN>O||CH>O||CR>O||COR
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B
O||CH>O||CR>O||COR>CN>NO2
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C
CN>NO2>O||CH>O||CR>O||C_OR
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D
O||CH>NO2>CN>O||COR>O||CR
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Solution

The correct option is A NO2>CN>O||CH>O||CR>O||COR
Conjugation of electron withdrawing groups, e.g., CHO,O||CR,O||COR,CN,NO2

activates nucleophilic attack in halobenzene.

The order of reactivity of these groups is
NO2>CN>O||CH>O||CR>O||COR.

The electron withdrawing power of nitro group is maximum and the electron withdrawing power of ester group is minimum.

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