General Organic Chemistry Question 8

Question 8 - 29 January - Shift 1

Compound that will give positive Lassaigne’s test for both nitrogen and halogen is

(1) $N_2 H_4 \cdot HCl$

(2) $CH_3 NH_2 . HCl$

(3) $NH_4 Cl$

(4) $NH_2 OH . HCl$

Show Answer

Answer: (2)

Solution:

Formula: Lassaigne’s Test

$CH_3 NH_2 . HCl \xrightarrow[\text{ fusion }]{Na} NaCN$ and $NaCl$

$NaCN$ gives $+ve$ test for nitrogen and

$NaCl$ gives + ve test for halogen