CBSE 2025 · Region 1 · Set 2 · Q24 · 3 marks
(a)Arrange the following in decreasing order of $\displaystyle \mathrm{pK}_{\mathrm{b}}$ : Aniline, p-nitroaniline, p-methylaniline(b)Account for the following :(i)Diazonium salts of aromatic amines are more stable than those of aliphatic amines.(ii)Methylamine in water reacts with $\displaystyle \mathrm{FeCl}_{3}$ to precipitate hydrated ferric oxide.
(a)
Arrange the following in decreasing order of $\displaystyle \mathrm{pK}_{\mathrm{b}}$ : Aniline, p-nitroaniline, p-methylaniline
(b)
Account for the following :
(i)
Diazonium salts of aromatic amines are more stable than those of aliphatic amines.
(ii)
Methylamine in water reacts with $\displaystyle \mathrm{FeCl}_{3}$ to precipitate hydrated ferric oxide.
Marking-scheme solution
(a)
p-nitroaniline > Aniline > p-methylaniline
(i)
Due to resonance stabilization.
(ii)
Methylamine in water acts as a base and release OH- ions which reacts with FeCl3 to
form hydrated ferric oxide. / chemical equation
AminesChemical Reactions of AminesUnderstandshort_answermedium
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CBSE Class 12 Chemistry past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.