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Q. Presence of peroxide in ethers of old stock can be tested by first treating them with $FeSO_{4}$ solution and then adding an aqueous solution of....& from red colour solution

NTA AbhyasNTA Abhyas 2022

Solution:

Presence of peroxide in ethers of old stock can be tested by first treating them with $FeSO_{4}$ solution and then adding an aqueous solution of KCNS.
Ethers form peroxides, when come in contact with air and light.
Solution
$Fe^{3 +}+KCNS \rightarrow $ Red colour