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Q.

 Which of the following substituents has +M (Mesomeric) effect ?
 

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a

 -CHO

b

-NH2

c

-CN

d

 -NO2

answer is C.

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Detailed Solution

Given data: It is given to identify that which substituents has +M (Mesomeric) effect.
Explanation:  When the electrons or the pi electrons are transferred from a selected group towards a conjugate system, thus increasing the electron density of the conjugated system then such a phenomenon is understood as (+M) effect or positive mesomeric effect.
 

NR2 , - NH2 , - NHR` groups are +M groups.

Hence, option (C) -NH2 is correct answer.
 

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