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An unknown compound (A) has a molecular ...

An unknown compound (A) has a molecular formula `C_(4)H_(6)`. When (A) is treated with excess of `Br_(2)` a new substance (B) with formula `C_(4)H_(6)Br_(4)`. Is formed (A) forms a white ppt. with ammonical silver nitrate solution. (A) may be,

A

Butyne-1

B

Butyne-2

C

Butene-2

D

Butene-1

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