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  • In Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with <img alt="Fe^{3+}" src="https://entrancecorner.oncodecogs.com/gif.latex?F

In Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with Fe^{3+} due to the formation of -

Option: 1

Fe_4[Fe(CN)_6]_3.xH_2O


Option: 2

NaSCN


Option: 3

[Fe(CN)_6NOS]^{4-}


Option: 4

[Fe(SCN)]^{2+}


Answers (1)

best_answer

In case, nitrogen and sulphur both are present in an organic compound, sodium thiocyanate is formed. It gives blood red colour.
\mathrm{Na+C+N+S\rightarrow NaSCN}

\mathrm{Fe^{3+}+SCN^-\rightarrow\underset{Blood\ Red}{ [Fe(SCN)]^{2+}}}
Correct option 4.

Posted by

Irshad Anwar

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