How can we distinguish between butyne-1 and butyne-2?

By alkaline

K M n O_{4}

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B r_{2}

water

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By ammoniacal cuprous chloride

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By Benedict reagent

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Solution

The correct option is B By alkaline $K M n O_{4}$
Alkaline $K M n O_{4}$ oxidised the 1-butyne into acid and carbon-di-oxide
$C H_{3} C H_{2} C \equiv C H H o t K M n O_{4} - ------- \to C H_{3} C H_{2} C O O H + [H C O O H] [O] - \to C O_{2} + H_{2} O$
It does not give this test with 2-butyne.

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