What is the correct order of inductive effect>?

- O^{-} > - C H_{3} > - C M e_{3}

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- C O_{2}^{-} > - O^{-} > - C H M e_{3}

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- O^{-} > C H_{2} M e_{2} > D > H

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Solution

The correct option is C $- O^{-} > - C H_{3} > - C M e_{3}$
(A) Order: $- O^{-} > - C H_{3} > - C M e_{3}$
This is correct order of inductive effect as inductive effect of electronegative $- O^{-}$ is greater than that of $- C H_{3}$ and $- C M e_{3}$ .
(B) Order: $- C O_{2}^{-} > - O^{-} > - C H M e_{2}$ This is incorrect order because inductive effect of $- C O_{2}^{⊝}$ is less than that of electronegative $- O^{-}$ .
(C) Order: $- O^{-} > - C H M e_{2} > D > H$ This is incorrect order because inductive effect of $H$ is more than that of $D$ . Because of one extra neutrons size of $D$ is higher than $H$ as a result this increased size reduces electronegativity of $D$ .

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