A unknown gas 'A' decolourises bromine in $C C l_{4}$ and forms a precipitate with ammoniacal silver nitrate. The gas 'A' is:

C_{2} H_{2}

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C_{2} H_{4}

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C_{2} H_{6}

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C H_{4}

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Solution

The correct option is A $C_{2} H_{2}$
Acetylene gas decolourises bromine in $C C l_{4}$ $C H \equiv C H + 2 B r_{2} C C l_{4} ⟶ B r_{2} C H - C H B r_{2}$
Acetylene reacts with ammoniacal silver nitrate to produce disilver acetylide.
$C H \equiv C H \to + 2 [A g (N H_{3})_{2}] N O_{3} \to + A g - C \equiv C^{-} A g^{+} ↓ p p t$

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