Hexane is alkane and hexene is alkene.
They can be distinguish by bromine test.
Hexane being a saturated hydrocarbon does not decolourizes Br2 in CCl4 and hexene being unsaturated decolourizes Br2 in CCl4.
Reaction : CH3CH2CH2CH2CH2=CH2 + Br2 in CCl4 ------> CH3CH2CH2CH2CH2(Br)CH2Br ( colourless)
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