Question

What is Lassaigne’s test extract called as?

(a) Fusion extract

(b) Sodium fusion extract

(c) Lassaigne extract

(d) Sodium extract

The question was asked in an interview for internship.

The question is from Qualitative Analysis of Organic Compounds topic in division Organic Chemistry – Basic Principles and Technique of Chemistry – Class 11

Answer 1

Correct option is (b) Sodium fusion extract

To explain I would say: Lassaigne’s test extract is called as sodium fusion extract. The cyanides, sulphides and halides of sodium will be formed. These will be extracted from the fused mass by boiling it with distilled water. Hence, the name of the extract is sodium fusion extract.