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Sulphonation of Aromatics

Reagents used...

Question

Reagents used to identify $C o^{2 +}$ is :

N H_{4} C N S

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D M G

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H C N

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None of the above

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Solution

The correct option is A $N H_{4} C N S$
Co(II) ions reacts with ammonium thiocyanate and forms blue coloured ammonium cobaltothiocyanate.
$C o C l_{2} + 4 N H_{4} C N S \to (N H_{4})_{2} [C o (C N S)_{4}] b l u e c o l o u r + 2 N H_{4} C l$

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F e^{3 +}

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