Which of the following reagents distinguish ethylene from acetylene?

Ammonical cuprous chloride

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B r_{2}

water

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Alkaline

K M n O_{4}

solution

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Chlorine dissolved in

C C l_{4}

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Solution

The correct option is C Ammonical cuprous chloride
Ethyne or acetylene forms a red precipitate of copper acetylide ( $C u_{2} C_{2}$ ) when it is passed through ammonical cuprous chloride solution.
Ethene does not react with $A g N O_{3}$ or $C u C l_{2}$ solution.

$C H$ $\equiv$ $C H$ + $C u_{2} C l_{2}$ + $N H_{4} O H$ $\to$ + $C u - C$ $\equiv$ $C u$ + $N H_{4} C l$ + $2 H_{2} O$

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What do you observe when ethylene is passed through alkaline $K M n O_{4}$ solution ?

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