Which of the following complex formation indicates the presence of sulphur in the organic compound when sodium nitroprusside is added to sodium extract of the compound ?

Options

A. `Fe_(4)[Fe(CN)_(6)]_(3)`
B. `Na_(2)[Fe(NO)(CN)_(5)]`
C. `Fe_(4)(CNS)_(3)`
D. `Na_(4)[Fe(CN)_(5)NOS]`

Answer

D

Explanation

The formation of sodium thionitriprusside (purple) shows the presence of sulphur
`underset("Sodium extract")(Na_(2)S)+underset("Sodium nitroprusside")(Na_(2)[Fe(NO)(CN)_(5)])rarr underset(underset(("purple"))("Sodium thionitroprusside"))(Na_(4)[Fe(CN)_(5)NOS])`