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Hydrocarbons

Question
CBSEENCH11007841

How do alkynes react with hypochlorous acids? Discuss its mechanism. 
Or
HC space identical to space CH space rightwards arrow with Cl subscript 2 divided by straight H subscript 2 straight O on top space CHCl subscript 2 space minus space CHO

Solution

Both hypochlorous acid HOCl (Cl2 | H2O) and hypobromous acid HOBr (Br2 | H2O) react with alkynes in two steps.

Mechanism: It is an example of electrophilic addition and proceeds in two steps:

Step II. The electrophilic addition is repeated again when the final compound gets formed.