question_answer

Match the organic compounds in column - I with the Lassaigne's test results in column - II appropriately : [JEE Main Online Paper (Held On 11 April 2015)]  

Column-I		Column-II
(A)	Aniline	(i)	Red color with \[FeC{{l}_{3}}\]
(B)	Benzene sulfonic acid	(ii)	Violet color with sodium nitroprusside
(C)	Thiourea	(iii)	Blue color with hot and acidic solution of \[FeS{{O}_{4}}\]

 

A)  (A) - (ii);  (B) - (i);  (C) - (iii)

B)  (A) - (iii); (B) - (ii); (B) - (i)

C) (A) - (ii); (B) - (iii); (C) - (i)

D) (A) - (iii); (B) - (i); (C) - (ii)

Correct Answer: B

Solution :

(a) (b) (c) \[\underset{\text{Thiourea}}{\mathop{N{{H}_{2}}-\underset{C}{\overset{S}{\mathop{||}}}\,-N{{H}_{2}}}}\,\xrightarrow[{}]{Na}NaSCN\xrightarrow[{}]{FeC{{l}_{3}}}\underset{\text{Red}\,\text{colour}}{\mathop{F{{e}_{4}}{{\left[ Fe{{\left( SCN \right)}_{6}} \right]}_{3}}}}\,\]