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  4. If on adding FeCl3 solution to acidified Lassaigne solution, a blood red colouration is produced, it indicates the presence of

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Q. If on adding $FeCl_{3}$ solution to acidified Lassaigne solution, a blood red colouration is produced, it indicates the presence of

Organic Chemistry – Some Basic Principles and Techniques

Solution:

$3NaCNS + Fe^{3+} \to \underset{\text{(Blood red)}}{Fe(SCN)_{3}}+ {3Na^{+}}$