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Write the structures of A & B obtained ...

Write the structures of A & B obtained in the given reactions:
`Aoverset(HBr)larrR-CH=CH_2overset(Br_2//C""Cl_4)toB`

Text Solution

Verified by Experts

A is `R-CHBr-CH_3` and is `RCHBrCH_2Br`.
The alkene,HBr and the formed alkyl bromide (A) are all colouless. So, the left reaction cannot be used to detect ethylenic unsaturation. On th other hand , the alkene and the formed diboromoalkane (B) are colouless but bromine has reddish-brown colour. so, the right reaction can be used to detect ethylenic unsaturation because decolourisation of bromine takes place in this reaction.
`underset("Alkene (colourless)")(R-CH=CH_2)+underset("reddish brown")(Br_2//C""Cl_4to)underset("Alkyl dibromide or dibromoalkane (colourless)")(R-CHBr-CH_2Br)`
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