Order of increasing +I effect of the following is: I. −O⊖ II. CH33C− III. CH32CH− IV. C2H5−

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IV < III < II < I

I < IV < III < II

I < II < III < IV

II < III < IV < I

answer is A.

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Detailed Solution

Atoms or groups which release electrons towards a carbon atom are said to have a +I effect. Methyl group release electrons towards carbon. i.e., it has +I effect. +I effect increases as the number of methyl groups increases.has lone pair of electrons, with negative charge, so it has maximum +I effect.

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