Ethers in contact with air for a long time form peroxides. The presence of peroxide can be tested by adding $F e^{2 +}$ ions followed by the addition of:

K C N S

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S n C l_{2}

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H g C l_{2}

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K I

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Solution

The correct option is A $K C N S$
On exposure with air for a long time, ethers are converted into highly explosive peroxides.

The formation of peroxides is tested by addition of aqueous ferrous ammonium sulphate solution and potassium thiocyanate.

In the presence of peroxide, $F e^{2 +}$ ions are oxidized to $F e^{3 +}$ ions.

They react with thiocyanate ions to from red colored ferric thiocyanate.

$F e^{2 +} p e r o x i d e - ---- \to F e^{3 +} C N S^{-} - --- \to F e (C N S)_{3}$

Option A is correct.

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Ethers in contact with air for a long time form peroxides. The presence of peroxide can be tested by adding Fe2+ ions followed by the addition of:

Ethers in contact with air for a long time form peroxides. The presence of peroxide can be tested by adding $F e^{2 +}$ ions followed by the addition of: