True / False

A red solution is obtained when ferric chloride solution is added to sodium extract. It indicates both nitrogen and sulphur are present in the organic compound.

ATRUE
Correct Answer
BFALSE

Solution

Ferric Chloride $$(FeCl_{3})$$ that reacts with Sodium Thiocyanate $$(NaCNS)$$ to form Ferric Thiocyanate $$[Fe(CNS)_{3}]$$ which is blood red in color. This test can be used as a confirmatory test for organic compounds containing both Nitrogen and Sulfur (e.g. Methionine amino acid).

$$NaCN+S_{8} \overset{\Delta }{\rightarrow }\underset{\mathit{Sodium\ Thiocynate}}{NaSCN}$$

$$Fe^{+3}+3NaSCN \rightarrow \underset{\ \ Ferric\ thiocynate\\ \\ (Blood\ red\ colouration)}{Fe(SCN)_{3}}$$

$$\mathbf{Hence\ the\ correct\ answer\ is\ the\ option \ (A)}$$

SIMILAR QUESTIONS

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