Amines Part 3

Concept:In Hinsberg's test, only secondary amines form alkali insoluble sulfonamides because the sulfonamide has no N–H bond to react with alkali.Explanation:Alkali insoluble sulfonamides are formed only from secondary amines.From the list, identify all secondary amines (two alkyl/aryl groups on nitrogen).Secondary amines: N-Methylaniline ($\mathrm{C_6H_5NHCH_3}$), N-Methyl methanamine ($\mathrm{CH_3NHCH_3}$), N-propylaniline ($\mathrm{C_6H_5NHC_3H_7}$), N-phenylaniline ($\mathrm{C_6H_5NHC_6H_5}$).All others are primary or tertiary amines, which give alkali soluble or no solid sulfonamide.Thus, total 4 alkali insoluble solid sulfonamides.Answer:4 (Option D)