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Solution


Q.

Identify correct statements:
(A) Primary amines do not give diazonium salts when treated with NaNO2 in acidic condition.
(B) Aliphatic and aromatic primary amines on heating with CHCl3 and ethanolic KOH form carbylamines.
(C) Secondary and tertiary amines also give carbylamine test.
(D) Benzenesulfonyl chloride is known as Hinsberg’s reagent.
(E) Tertiary amines react with benzenesulfonyl chloride very easily.

Choose the correct answer from the options given below:                [2025]
1 (B) and (C) only  
2 (D) and (E) only  
3 (B) and (D) only  
4 (A) and (B) only  

Ans.

(3)

R-NH2→NaNO2+HClRN2+Cl- (unstable)→H2OROH+N2+HCl

Ar-NH2→NaNO2+HClArN2+Cl- (stable at 0-5°C)

(B)(C) Carbylamine reaction - Aliphatic and aromatic primary amines on heating with chloroform and ethanolic potassium hydroxide form isocyanides or carbylamines which are foul smelling substances. Secondary and tertiary amines do not show this reaction. This reaction is known as carbylamine reaction or isocyanide test and is used as a test for primary amines.

Ar/R-NH2+CHCl3+3KOH→Ar/R-NC+3KCl+3H2O

(D)(E) Benzenesulphonyl chloride (C6H5SO2Cl), which is also known as Hinsberg’s reagent, reacts with primary and secondary amines to form sulphonamides. Tertiary amines do not have replaceable hydrogen connected to nitrogen and hence do not react with C6H5SO2Cl.