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Question

In a reaction of C6H5Y, the major product (>60%) is m-isomer, so the group Y is

A
COOH
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B
NH2
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C
OH
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D
Cl
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Solution

The correct option is A COOH
COOH because it is meta directing group while NH2,OH and Cl are ortho and para directing groups.

NH2 and OH are one of the strongest and powerful ortho/para directing group due to the electron donating ability of NH2. It shows +R effect. Hence they more activating group than others.

COOH is one of the strongest deactivating group, it reduces the electron density at ortho and para position by -R effect. Hence, it is the strongest meta-directing group than others.

Cl weak meta directing groups due to -I effect and strong ortho and para directing groups due to +R effect.

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