(a) In Hofmann method, a mixture of primary, secondary and tertiary amines is treated with diethyloxalate, when primary amine forms solid oxamide, secondary amine forms a liquid oxamic ester whereas tertiary amine remains unaffected.
(b) With Lucas reagent, $3^{\circ}$ alcohols immediately produce turbidity, $2^{\circ}$ alcohols give turbidity within $5$ minutes while $1^{\circ}$ alcohols give no turbidity at room temperature.
(c) In Victor Meyer test, $1^{\circ}$ alcohols give blood red colour, $2^{\circ}$ alcohols give blue colour while $3^{\circ}$ alcohols give no colour.
(d) Kolbe method is used to introduce a $- COOH$ group in phenol. Hence, Hofmann method is used to separate a mixture of $1^{\circ}, 2^{\circ}$ and $3^{\circ}$ amines.
