Which one of ...

Question

Which one of the following reagents is used for detection of unsaturation in alkenes?

N a O H + C a O

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cold dilute alkaline

{K M n O}_{4}

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{C l}_{2} / h v

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K O H / C_{2} H_{5} O H

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Solution

The correct option is A cold dilute alkaline ${K M n O}_{4}$
Ethylene reacts with alkaline ${K M n O}_{4}$ solution and glycol(ethane-1,2-diol) forms as a product.

In this reaction, the pink colour of ${K M n O}_{4}$ disappears and turns into brown colour and this reaction is used for testing of unsaturation.

Hence, option B is correct.

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