Distinction between pairs of compounds
Chlorobenzene `(C_(6)H_(5)Cl)` and n-hexylchloride `(C_(6)H_(13)Cl)`

Explanation

Followin test helps to distinguish these :
n-Hexylchloride (haloalkane) is more reactive than chlorobenzene towards nucleophilic substitution. When n-hexylchloride is heated with aq. KOH, n-hexyl alcohol and KCl are formed. The resulting solution (containing KCl) gives white ppt. with `AgNO_(3)` solution. Chlorobenzene does not give this test.
`underset("n-Hexylchloride")(CH_(3)(CH_(2))_(4)CH_(2)Cl)+KOH(aq.)overset(Delta)rarrunderset("n-Hexylalcohol")(CH_(3)(CH_(2))_(4)CH_(2)OH)+KCl`
`KCl+AgNO_(3)rarrunderset("White ppt.")(AgCldarr)+KNO_(3)`