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$(A)$ The molecular formula $C_4H_6$ corresponds to the general formula $C_nH_{2n-2}$, which indicates an alkyne or a diene.Since $(A)$ reacts with ex

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but-$1$-yne

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$(A)$ The molecular formula $C_4H_6$ corresponds to the general formula $C_nH_{2n-2}$, which indicates an alkyne or a diene.Since $(A)$ reacts with excess $Br_2$ to form $C_4H_6Br_4$, it indicates the presence of two double bonds or one triple bond.Terminal alkynes react with ammoniacal silver nitrate $(	ext{Tollens' reagent})$ to form a white precipitate of silver acetylide.But-$1$-yne $(CH_3-CH_2-C \equiv CH)$ is a terminal alkyne, whereas but-$2$-yne $(CH_3-C \equiv C-CH_3)$ is a non-terminal alkyne.Therefore, $(A)$ is but-$1$-yne.

An unknown compound $(A)$ has a molecular formula $C_4H_6$. When $(A)$ is treated with excess of $Br_2$, a new substance $(B)$ with formula $C_4H_6Br_4$ is formed. $(A)$ forms a white precipitate with ammoniacal silver nitrate solution. $(A)$ may be:

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