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NEET levelSingle correct optionDifficulty 1 of 3g1001

Which of the following groups shows a +I effect relative to hydrogen?

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

Answer: B

Alkyl groups push sigma electrons toward the attached atom (they are electron-releasing relative to H), so

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

is +I.

- NO X_{2}

,

- CN

and

- COOH

are electron-withdrawing (-I).

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