mechanism ?
Answer:
The
presence of double bond (i.e. un saturation) in a molecule can be detected by
the following two tests.
(i)
in 
test.
When 
is added to the solution of an
unsaturated compound in 
the orange
colour of disappears due to the
formation of colourless dibromo compound
Baeyer's test. When a cold aqueous alkaline solution of 
is added to the aqueous
solution or suspension of an unsaturated compound, the pink colour of solution gets discharged due
to the formation of the corresponding 1, 2-dihydroxy compound or 1, 2-glycol.
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