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Question

Decreasing - I power of given groups is:
1)CN
2)NO2
3)NH+3
4)F

A
2> 1> 4> 3
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B
2 > 3 > 4 > 1
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C
3 > 2 > 4> 1
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D
3 > 2 > 1 > 4
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Solution

The correct option is D 3 > 2 > 1 > 4
+NH3 is most e withdrawing since it is electron deficient and carrying a positive charge. Nitro group is also an electron withdrawing group. CN is moree withdrawing group than F because fluorine being smaller in size, is already carrying a negative charge and cannot withdraw any more electrons.
Hence, the order is +NH3>NO2>CN>F

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