Which of the following reagents is weakly activating group :

- N H_{2}

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- N R_{2}

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- C_{6} H_{5}

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- N H C O C H_{3}

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Solution

The correct option is A $- C_{6} H_{5}$
$C_{6} H_{5} -$ is weakly activating group due to delocalisation of electrons; all other groups are having lone pair of electrons so they are strong activating group as relative to $C_{6} H_{5} -$ .

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