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Q. (I) 1,2-dihydroxybenzene
(II) 1,3-dihydroxybenzene
(III) 1,4-dihydroxybenzene
(IV) Hydroxybenzene.
The increasing order of boiling points of above mentioned alcohols is

Chemical Bonding and Molecular Structure

Solution:

$1,4$-dihydroxy benzene shows highest boiling point among given compounds due to intermolecular $H$-bonding.