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Solution


Q.

Given below are two statements:

Statement (I): The NH2 group in Aniline is ortho and para directing and a powerful activating group.

Statement (II): Aniline does not undergo Friedel-Craft's reaction (alkylation and acylation).

In the light of the above statements, choose the most appropriate answer from the options given below:                  [2024]
1 Both Statement I and Statement II are correct  
2 Both Statement I and Statement II are incorrect  
3 Statement I is incorrect but Statement II is correct  
4 Statement I is correct but Statement II is incorrect  

Ans.

(1)

Statement (I): Due to its +M effect, -NH2 group increases electron density at ortho and para positions of the benzene ring and hence it is ortho and para directing for electrophilic aromatic substitution reactions.

Statement (II): Aniline forms salt with aluminium chloride, a Lewis acid, used as a catalyst in Friedel-Crafts reaction. Due to this, nitrogen of aniline acquires positive charge and hence acts as a strong deactivating group for further reaction. Hence, Aniline does not undergo Friedel-Crafts reaction (alkylation and acetylation).