A) \[N{{a}_{2}}S\] and \[NaCN\]
B) NaSCN
C) \[N{{a}_{2}}S{{O}_{3}}\] and NaCN
D) \[N{{a}_{2}}S\] and NaCNO
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. \[3NaCNS+FeC{{l}_{3}}\to \underset{\text{(Blood red colour)}}{\mathop{\underset{\text{Ferric sulpho cyanide}}{\mathop{Fe{{(CNS)}_{3}}}}\,}}\,+3NaCl\]
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