CBSE 2022 · Region 3 · Set 1 · Q10 · 3 marks
Give reasons :(i)Ammonolysis of alkyl halides is not a good method to prepare pure primary amines.(ii)Aniline does not give Friedel-Crafts reaction.(iii)Although $\displaystyle -\mathrm{NH}_{2}$ group is o/p directing in electrophilic substitution reactions, yet aniline on nitration gives good yield of m-nitroaniline.
Give reasons :
(i)
Ammonolysis of alkyl halides is not a good method to prepare pure primary amines.
(ii)
Aniline does not give Friedel-Crafts reaction.
(iii)
Although $\displaystyle -\mathrm{NH}_{2}$ group is o/p directing in electrophilic substitution reactions, yet aniline on nitration gives good yield of m-nitroaniline.
Marking-scheme solution
(i) Because it gives a mixture of amines which is difficult to separate.
(ii) Aniline is a Lewis base and it reacts with \(\displaystyle \mathrm{AlCl}_{3}\) to form a salt / N of aniline acquires positive charge with \(\displaystyle \mathrm{AlCl}_{3}\) and hence is a deactivating group.
(iii) Because of protonation of aniline / formation of anilinium ion which deactivates the ring.
AminesPreparation of AminesUnderstandshort_answermedium
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CBSE Class 12 Chemistry past-paper question from the 2022board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.