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Chemistry Question on Organic Chemistry- Some Basic Principles and Techniques

Violet coloured complex obtained in the detection of sulphur is

A

Na2[Fe(NO)(CN)5]Na_2[Fe(NO)(CN)_5]

B

Na3[Fe(ONS)(CN)5]Na_{3}[Fe(ONS)(CN)_{5}]

C

Na4[Fe(CN)5NOS]Na_{4}[Fe(CN)_{5}NOS]

D

Both (b) and (c)

Answer

Na4[Fe(CN)5NOS]Na_{4}[Fe(CN)_{5}NOS]

Explanation

Solution

Sulphur of organic compounds is detected by using sodium nitroprusside. With it sulphur forms a violet colour complex, called sodium thionitroprusside. Na2S+Na2[Fe(CN)5NO]sodium nitroprusside→Na4[Fe(CN)5NOS]sodium thionitroprussideNa_2S + \underset{\text{sodium nitroprusside}}{Na_2[Fe(CN)_5NO]} \rightarrow \underset{\text{sodium thionitroprusside}}{Na_4[Fe(CN)_5NOS]}