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Organic Chemistry - Some Basic Principles and Techniques
Qualitative Analysis – Lassaigne's Test
1 question from 1 paper, each with its answer.
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- of Organic Chemistry - Some Basic Principles and Techniques
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Concepts tested
- blood red colour with N and S
All Questions
2023 1 question
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In Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with $Fe^{3+}$ due to the formation of
When N and S are both present, $NaSCN$ forms and gives $[Fe(SCN)]^{2+}$ (blood red) with $Fe^{3+}$.
In case nitrogen and sulphur both are present in an organic compound, sodium thiocyanate is formed. $Na+C+N+S\rightarrow NaSCN$ Which further reacts as: $Fe^{3+}+SCN^-\rightarrow[Fe(SCN)]^{2+}$ (blood red colour)