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NEET 2023
Exam
NEET
Year
2023
Subject
Chemistry
Chapter
General Organic Chemistry

NEET 2023 · Chemistry · General Organic Chemistry

In Lassaigne's extract of organic compound both nitrogen and...

In Lassaigne's extract of organic compound both nitrogen and sulphur are present, which gives blood-red colour with Fe3+{Fe}^{3 +} due to the formation of

Options

  1. A[Fe(SCN)]2+{\left[Fe\left(SCN\right)\right]}^{2 +}
  2. BFe4[Fe(CN)6]3.xH2O{Fe}_{4}{\left[Fe{\left(CN\right)}_{6}\right]}_{3} . {xH}_{2}O
  3. CNaSCNNaSCN
  4. D[Fe(CN)5NOS]4−{\left[Fe{\left(CN\right)}_{5}NOS\right]}^{4 -}

Correct answer

A. [Fe(SCN)]2+{\left[Fe\left(SCN\right)\right]}^{2 +}

Step-by-step solution

When the organic sample containing nitrogen and sulphur is strongly heated with sodium metal the ionic compound sodium thiocyanate is formed. Sodium thiocyanate gives blood-red colour with neutral FeCl3{FeCl}_{3}.

Na+N+C+S→NaSCNSCN−+Fe3+→[Fe(SCN)]2+Na + N + C + S\overset{}{\to}NaSCN{SCN}^{-} + {Fe}^{3 +}\overset{}{\to}{\left[Fe\left(SCN\right)\right]}^{2 +}

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