CBSE Class 12 · 2003 · Delhi Compartment · Compounds Containing NitrogenVery Short Answer

Give a chemical test to distinguish between the following pair of compounds: CH₃CH₂NH₂ and (CH₃)₂NH.

Answer: Carbylamine test: ethylamine (1°) + CHCl₃/alc. KOH → foul isocyanide smell; dimethylamine (2°) gives none.

Solution

Warm each with CHCl

_{3}

+ alcoholic KOH:

C_{2} H_{5} N H_{2} + CHC l_{3} + 3KOH \to C_{2} H_{5} NC ↑ (foul) + 3KCl + 3 H_{2} O

The secondary amine (CH

_{3}

)

_{2}

NH gives no such smell. (Hinsberg's reagent also distinguishes.)

CBSE Class 12 Board · 2003 · Delhi Compartment · Subjective