A gas decolourises bromine in CCl_4 and forms | vedclass

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(A) The gas that decolourises bromine in $CCl_4$ must be an unsaturated hydrocarbon (alkene or alkyne). Formation of a white precipitate with ammoniac

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$C_2H_2$

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(A) The gas that decolourises bromine in $CCl_4$ must be an unsaturated hydrocarbon (alkene or alkyne). Formation of a white precipitate with ammoniacal silver nitrate (Tollens' reagent) is a characteristic test for terminal alkynes $(R-C\equiv CH)$. $C_2H_2$ (acetylene) is a terminal alkyne that reacts as follows: $HC\equiv CH + 2Br_2 \xrightarrow{CCl_4} CHBr_2-CHBr_2$ (decolourisation of bromine). $HC\equiv CH + 2[Ag(NH_3)_2]^+ + 2OH^- 	o AgC\equiv CAg \downarrow + 4NH_3 + 2H_2O$ (white precipitate of silver acetylide).

$A$ gas decolourises bromine in $CCl_4$ and forms a precipitate with ammoniacal silver nitrate. The gas is

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