1.

An organic compound reacts with Cu_2Cl_2 and also decolourise Br_2 water is

Answer»

`CH_3-C-=C-CH_3`
`CH_2=CH-CH_3`
`CH_3-C-=CH`
`CH_3-CH_3`

Solution :Alkenes and alkynes both decolourise bromine water, but only alkynes , containing TERMINAL H atom reacts with ammonical cuprous CHLORIDE solution.
`CH_3-C-=Chunderset(H_2O)overset(Br_2)to CH_3-undersetunderset(Br)(|)C=CHBr UNDERSET(H_2O)overset(Br_2)to CH_3-undersetunderset(Br)(|)oversetoverset(Br)(|)C-undersetunderset(Br)(|)overset(Br)overset(|)C`
`CH_3-C-=underset(Cu_2Cl_2)overset"ammonical"toCH_3-C-=C Cu`


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