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(D) Terminal alkynes,such as compound $(iii)$,contain an acidic hydrogen atom attached to the $sp$-hybridized carbon.Ammoniacal silver nitrate (Tollen

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Ammoniacal silver nitrate reagent

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(D) Terminal alkynes,such as compound $(iii)$,contain an acidic hydrogen atom attached to the $sp$-hybridized carbon.Ammoniacal silver nitrate (Tollens' reagent) reacts with terminal alkynes to form a white precipitate of silver acetylide.$CH_3-CH_2-C\equiv CH + [Ag(NH_3)_2]^+ + OH^-$ $ightarrow CH_3-CH_2-C\equiv C^- Ag^+ 	ext{ (white precipitate)} + 2NH_3 + H_2O$Compounds $(i)$,$(ii)$,and $(iv)$ do not possess acidic terminal hydrogen atoms and therefore do not form a precipitate with this reagent.

Which is the most suitable reagent among the following to distinguish compound $(iii)$ from the rest of the compounds?
$(i)$ $CH_3-C\equiv C-CH_3$
$(ii)$ $CH_3-CH_2-CH_2-CH_3$
$(iii)$ $CH_3-CH_2-C\equiv CH$
$(iv)$ $CH_3-CH=CH_2$

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Which is the most suitable reagent among the following to distinguish compound $(iii)$ from the rest of the compounds?$(i)$ $CH_3-C\equiv C-CH_3$$(ii)$ $CH_3-CH_2-CH_2-CH_3$$(iii)$ $CH_3-CH_2-C\equiv CH$$(iv)$ $CH_3-CH=CH_2$