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  4. Violet coloured complex obtained in the detection of sulphur is

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Q. Violet coloured complex obtained in the detection of sulphur is

AFMCAFMC 2010Organic Chemistry – Some Basic Principles and Techniques

Solution:

Sulphur of organic compounds is detected by using sodium nitroprusside. With it sulphur forms a violet colour complex, called sodium thionitroprusside.
$Na_2S + \underset{\text{sodium nitroprusside}}{Na_2[Fe(CN)_5NO]} \rightarrow \underset{\text{sodium thionitroprusside}}{Na_4[Fe(CN)_5NOS]}$