Question

Distinguish by chemical test between n-hexane and benzene

Answer 1

Hexane and benzene are very dissimilar. For one thing, because benzene is aromatic, and is very hydrogen deficient compared to hexane, when it burns, it forms soot. So a black smoke raises from it, while when hexane burns, the smoke it typically white, if there's any smoke at all. So here's a chemical test for you.

Answer 2

hexane is saturated hydrocarbon

benzene is unsaturated hydrocarbon

benzene is the property of de localisation (resonance) but hexane does not this property