Which among the following groups shows maximum electron withdrawing effect?

- C N

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- C H O

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- N O_{2}

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-^{+} F_{3}

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Solution

The correct option is D $-^{+} F_{3}$
Electron withdrawing group means substituent which withdraws electron pair towards itself. The $-^{+} F_{3}$ shows maximum electron withdrawing effect due to presence of positive charge. The order of electron withdrawing effect is $-^{+} F_{3}$ > $- N O_{2}$ > $- C N$ > $- C H O$ . So correct answer will be option(d).

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