(I) 1, 2-dihydroxy benzene (II) 1, 3-dihydroxy benzene (III) 1, 4-dihydroxy benzene (IV) Hydroxy benzene The increasing order of boiling points of above mentioned alcohols is

Step-by-step solution

1, 4-dihydroxy benzene shows the highest boiling point among given compounds because it form strong intermolecular hydrogen bond (It does not form intramolecular H -bonding). Order of H-bonding in o, m and p -isomers of a compound is given below. Intermolecular H -bonding 0 m>p -isomers Hydroxy benzene do not form a chain of H -bonding. Hence, intermolecular H -bond is stronger then intermolecular H -bond, so the stability of 1, 4-dihydroxy benzene is highest. Hence, its boiling point is highest. The increasing ord