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Question

Choose the correct statement(s) for the following compounds

A
+M effect of NH2 operates at ortho, para and meta positions.
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B
CH3 group increases the electron density at ortho and para positions due to Hyperconjugation (H) effect.
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C
NH2 group increases the electron density at ortho and para positions and is called an activating group.
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D
CH3 group increases the electron density at ortho and para positions due to mesomeric (M) effect.
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Solution

The correct option is C NH2 group increases the electron density at ortho and para positions and is called an activating group.
NH2 group shows +M effect. It is called an activating group because it increases the electron density at ortho and para position as shown :


Both M effect and H effect will operate only at ortho/para positions and not at meta positions.
Hyperconjugation in C6H5CH3:


Note: The effect due to hypergonjugation is generally less dominating than mesomeric effect, but more dominating than inductive effect.

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