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Question

The correct order of strength of +I effect is:
I. −CH3 II. −CD3 III. −CT3 IV. −CHD2

A
I > II > III > IV
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B
I > IV > II > III
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C
III > IV > II > I
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D
III > II > IV > I
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Solution

The correct option is D III > II > IV > I
The order of electropositive nature of atoms is T>D>H.
More electropositive atom will show more +I effect due to its higher ability to donate shared pair of electrons.
Therefore, the correct order of strength of +I effect is :
CT3>CD3>CHD2>CH3

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