Question

Given below are two statements:
Statement I: In Lassaigne's test, the covalent organic molecules are transformed into ionic compounds.
Statement II: The sodium fusion extract of an organic compound having N and S gives prussian blue colour with FeSO4 and Na4[Fe(CN)6].
In the light of the above statements, choose the correct answer from the options given below.

• A. Both Statement I and Statement II are true
• B. Both Statement I and Statement II are false
• C. Statement I is false but Statement II is true
• D. Statement I is true but Statement II is false

Hint:

In Lassaigne's test, the presence of nitrogen and sulfur in an organic compound is tested by forming cyanide and thiocyanate ions after fusion with sodium. Prussian blue formation is specific to compounds containing nitrogen in the form of cyanides.

Answer 1

The Correct Option is D

Statement I: In Lassaigne's test, the organic compounds containing N and S elements undergo fusion with sodium metal. This forms sodium cyanide (NaCN) and sodium thiocyanate (NaSCN), which are ionic compounds. Hence, Statement I is true. 
Statement II: The fusion of an organic compound containing N and S with sodium gives blood red colour with FeSO4 and Na4[Fe(CN)6] (not prussian blue colour). Hence, Statement II is false.
Thus, the correct answer is (4) Statement I is true but Statement II is false.