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NEET levelSingle correct optionDifficulty 1 of 3g1005

Which of the following is a -I group?

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

Answer: A

- NO X_{2}

withdraws sigma electrons strongly and is the -I group.

- CH X_{3}

and

- CH X_{2} CH X_{3}

are +I, and

- O X^{-}

is a +I group because of its negative charge.

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