How the following pairs can be distinguished ?
(i) Phenol and benzoic acid.
(ii) Phenol and glycerol.
(iii) Phenol and ethyl alcohol .
(iv) Phenol and salicyclic acid.
(v) 1-Phenylethanol and 2-phenylethanol.
(vi) Phenol and benzyl alcohol.
(vii) Phenol and acetic acid.
(viii) Phenol and cyclohexanol.