What is significance of reaction of bromine in with alkenes and alkynes?

Asked by naveen.mohandas | 12th Feb, 2011, 09:09: PM

Expert Answer:

Dear Student

 Unsaturated hydrocarbons such as alkenes and alkynes are much more reactive than the parent alkanes. They react rapidly with bromine, for example, to add a Br2 molecule across the C=C double bond.

This reaction provides a way to test for alkenes or alkynes. Solutions of bromine in CCl4 have an intense red-orange color. When Br2 in CCl4 is mixed with a sample of an alkane, no change is initially observed. When it is mixed with an alkene or alkyne, the color of Br2 rapidly disappears.

 

We hope that clarifies your query.

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Answered by  | 13th Feb, 2011, 10:19: PM

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