Identify a reagent from the following list which can easily distinguish between 1-butyne and 2-butyne.

B r_{2}

C C l_{4}

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H_{2}, P d, B a S O_{4}

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Dilute

H_{2} S O_{4}

H g S O_{4}

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[A g (N H_{3})_{2}] N O_{3}

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Solution

The correct option is D $[A g (N H_{3})_{2}] N O_{3}$
Only terminal alkynes (but-1-yne) react with ammoniacal solution of silver nitrate $(A g N O_{3})$ or cuprous chloride (CuCl).
$C H_{3} - C H_{2} - C \equiv C H + 2 [A g (N H_{3})_{2}] N O_{3} \to C H_{3} - C H_{2} - C \equiv C^{-} A g^{+} white ppt$

$C H_{3} - C \equiv C - C H_{3} + 2 [A g (N H_{3})_{2}] N O_{3} \to No reaction$
Hence correct option is d.

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