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JEE Main levelOne or more correct optionsDifficulty 2 of 3g1012

Which of the following groups are electron-withdrawing by the -I effect relative to hydrogen?

A $- NO X_{2}$
B $- C (CH X_{3}) X_{3}$
C $- CN$
D $- O X^{-}$

Answer: A, C

- NO X_{2}

and

- CN

pull sigma electrons toward themselves (-I).

- O X^{-}

and

- C (CH X_{3}) X_{3}

release electron density (+I).

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