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प्रश्न
Why is \[\ce{NH2}\] group of aniline acetylated before carrying out nitration?
उत्तर
Direct nitration of aniline is not possible on account of oxidation of –NH2 group. However, nitration can be carried after protecting the –NH2 group by acetylation to give acetanilide which is then nitrated and finally hydrolysed to give o- and p-nitroanilines.
The acetyl group being electron-withdrawing attracts the lone pair of electrons of the N-atom towards carbonyl group.
As a result, the activating effect –NH2 group is reduced i.e., the lone pair of electrons on nitrogen is less available for donation to benzene ring by resonance. Therefore, activating effect of –NHCOCH3 group is less than that of the –NH2 group.
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संबंधित प्रश्न
The conversion of primary aromatic amines into diazonium salts is known as ___________
Write a short note on diazotisation.
Product ‘P’ in the above reaction is:
Identify X in the sequence given below
The major product of the following reaction:
Write a short note on the following.
Coupling reaction
Write a short note on the following.
Gomberg reaction
Account for the following.
Diazonium salts of aromatic amines are more stable than those of aliphatic amines.
Account for the following.
Amines are more basic than amides.
What would be the major product of the following reaction?
\[\ce{C6H5 - CH2 - OC6H5 + HBr -> A + B}\]
