b)
i) Arrange the following in increasing order of basic strength in aqueous solution: CH₃NH₂, (CH₃)₃N, (CH₃)₂NH.
ii) What is Hinsberg's reagent?
iii) What is the role of pyridine in the acylation reaction of amines?
i) Arrange the following in increasing order of basic strength in aqueous solution: CH₃NH₂, (CH₃)₃N, (CH₃)₂NH.
ii) What is Hinsberg's reagent?
iii) What is the role of pyridine in the acylation reaction of amines?
Solution
(i)
(ii) Hinsberg's reagent is \textbf{benzenesulphonyl chloride}, CHSOCl — it distinguishes 1°/2°/3° amines.
(iii) Pyridine neutralises the HCl liberated during acylation (forming pyridinium chloride); removing the acid drives the reaction forward and keeps the amine unprotonated.
(ii) Hinsberg's reagent is \textbf{benzenesulphonyl chloride}, CHSOCl — it distinguishes 1°/2°/3° amines.
(iii) Pyridine neutralises the HCl liberated during acylation (forming pyridinium chloride); removing the acid drives the reaction forward and keeps the amine unprotonated.
CBSE Class 12 Board · 2022 · Subjective