Arrange the following groups in the order of decreasing (+I) effect with reference to hydrogen.
A
C6H5O−
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B
CR3
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C
COO−
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D
H
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E
CHR2
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Solution
The correct order : C6H5O−>COO–>CR3>CHR2>H
+I effect theoretically more for that group which directly attaiched atom have least electronegativity.
And then partial charge on directly attaiched atom so H=2.2 is least than others has higher +I effect.