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A hydrocarbon containing two carbon atom...

A hydrocarbon containing two carbon atoms decolourises bromine water and undergoes hydration by `H_2SO_4` in presence of `HgSO_4` to produce a compound which produces chloroform when heated with a solution of bleaching power. Write the name of the hydrocarbon and mention the reactions in support fo your arguments.

Text Solution

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The hydrocarbon decolourises bromine water. Hence, it is an unsaturated hydrocarbon. Since the hydrocarbon undergoes hydrates by `H_(2)SO_(4)` in the presence of `HgSO_(4)`, it is an alkyne.
The compound obtained on hydration of the hydrocarbon reacts with bleaching powder solution to produce chloroform. This reaction is a haloform reaction and the compounds containing `CH_(3)CO-` group participate in the haloform reaction. Now, acetylene is the only hydrocarbon containing two carbon atoms which reacts with `H_(2)SO_(4)//HgSO_(4)` to form acetaldehyde `(CH_(3)CHO)` having a `CH_(3)CO-` group. Acetaldehyde, on reacting with bleaching powder, produces chloroform. Therefore, the hydrocarbon is acetylene `(HC-=CH)`.
Reaction: `underset("(Acetylene) (red)")(HC-=CH + Br_(2)) overset(H_(2)O)rarr underset("Acetylene dibromide (colourless)")(BrCH = CHBr) HC-= CH + H_(2)O underset(70-80^(@)C)overset(H_(2)SO_(4)//Hg^(2+))rarr CH_(3)CHO` (Acetaldehyde)
`underset("Acetaldehyde")(CH_(3)CHO) underset("Heat")overset(Ca(OCl)Cl//H_(2)O)rarr underset("Chloroform")(CHCl_(3)) + underset("calcium formate")(Ca(HCOO)_(2))`
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