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(A) $Ag(NH_3)_2^{+}$ is called Tollen's reagent.It reacts with terminal alkynes ($1-$hexyne) to form a white precipitate of silver acetylide,but it do

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Tollen's reagent

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(A) $Ag(NH_3)_2^{+}$ is called Tollen's reagent.It reacts with terminal alkynes ($1-$hexyne) to form a white precipitate of silver acetylide,but it does not react with alkenes ($1-$hexene).$CH_3-CH_2-CH_2-CH_2-C\equiv CH + [Ag(NH_3)_2]^{+} + OH^{-}$ $\rightarrow CH_3-CH_2-CH_2-CH_2-C\equiv C^{-}Ag^{+} \downarrow + 2NH_3 + H_2O$Both Baeyer's reagent and Bromine water react with both alkenes and alkynes,so they cannot distinguish between them.

The reagent which could distinguish between $1-$hexyne and $1-$hexene is

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