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  4. How many of the following groups if substituted at o- and/or p - positions of chlorobenzene, increase its reactivity towards nucleophilic substitution? -CN,-(CH)3-NH(CH3),-COOH,-(NO)2,-(OCH)3

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Q. How many of the following groups if substituted at $o$- and/or $p$ - positions of chlorobenzene, increase its reactivity towards nucleophilic substitution?
$-CN,-\left(CH\right)_{3}-NH\left(CH_{3}\right),-COOH,-\left(NO\right)_{2},-\left(OCH\right)_{3}$

NTA AbhyasNTA Abhyas 2022

Solution:

The presence of electron-withdrawing groups $\left(l i k e - C N , - C O O H , - N O_{2}\right)$ at $o$- and $p$-positions with respect to
halogen atom activates the aryl halide towards nucleophilic substitution reactions.