Nitrogen Containing Compounds Question 13
Question: If N and S are present in an organic compound during Lassaigne test, then both changes into [CPMT 1997]
Options:
A) $ Na_2S $ and $ NaCN $
B) NaSCN
C) $ Na_2SO_3 $ and NaCN
D) $ Na_2S $ and NaCNO
Show Answer
Answer:
Correct Answer: B
Solution:
When sulphur and nitrogen both are present in organic compound during Lassaigne’s Test, both changes into “sodium thiocyanate”. (NaSCN) which gives a blood red colouration with Ferric ion. $ 3NaCNS+FeCl_3\to \underset{\text{(Blood red colour)}}{\mathop{\underset{\text{Ferric sulpho cyanide}}{\mathop{Fe{{(CNS)}_3}}},}},+3NaCl $
BETA
