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Question

Which of the following have +M effect (¯e-donating mesomeric effect) ?

A
NO2
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B
COOH
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C
NH2
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D
SR
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Solution

The correct options are
B NH2
D SR
NO2 and COOH are electron withdrawing groups whereas NH2 and SR have +M effect (¯e-donating mesomeric effect) due to presence of lone pairs of electrons.

Here (C) and (D) have LP ¯es¨NH2¨SR

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