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  4. In sulphur detection of an organic compound, sodium nitroprusside solution is added to sodium extract. Formation of violet colour is due to :

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Q. In sulphur detection of an organic compound, sodium nitroprusside solution is added to sodium extract. Formation of violet colour is due to :

Punjab PMETPunjab PMET 2005Organic Chemistry – Some Basic Principles and Techniques

Solution:

With sodium nitroprusside solution, the sodium extraction gives a purple colour of sodium thionitro prusside.
$\underset{\text{(present in sodium extract)}}{Na _{2} S _{(a q)}}+ \underset{\text{(sodium nitroprusside)}}{Na _{2}\left[ Fe ( CN )_{5} NO \right]}$
$\longrightarrow \underset{\text{Purple colour (Sodium thio nitro prusside)}}{Na _{4}\left[ Fe ( CN )_{5} NOS \right]}$