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Question

Arrange the following functional groups in the order of decreasing -I power (-ve inductive effect ):

A
SO3H
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B
Cl
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C
H
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D
NH2
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Solution

The group which withdraws electrons more will have more -I power.
Because of full or partial positive charge directly attached to carbon, the power of -I effect varies.
Here, in case of SO3H
oxygen is more electronegative than S. Therefore, it will withdraw electrons from S making it positive.Therefore,
-I effect will be more In SO3H
Cl is one of the most E.N. atom
Therefore, the order of -I effect is:

SO3H > Cl > NH2 > H


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