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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.When $A$ reacts with excess $

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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.When $A$ reacts with excess $Br_2$ to form $C_4H_6Br_4$,it indicates the addition of $2$ moles of $Br_2$,confirming the presence of a triple bond (alkyne).The formation of a white precipitate with ammoniacal silver nitrate (Tollen's reagent) indicates the presence of a terminal alkyne (acidic hydrogen).Therefore,the compound $A$ is $But-1-yne$ $(CH_3-CH_2-C \equiv CH)$.

An unknown compound $A$ has a molecular formula $C_4H_6$. When $A$ is treated with an 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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