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  4. Red colour complex ion formed on adding FeCl3 to S.E. (sodium extract) when N and S both are present in organic compound is

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Q. Red colour complex ion formed on adding $FeCl_3$ to S.E. (sodium extract) when N and S both are present in organic compound is

Organic Chemistry – Some Basic Principles and Techniques

Solution:

$Na + C + N + S \xrightarrow{\Delta} \underset{\text{Sodium thiocyanate (In S.E.)}}{CH_3COOH}$
$NaCNS + FeCl_3 \rightarrow +\underset{\text{Blood red colour}}{[Fe(CNS)]Cl)2} + NaCl$