(I) 1,-dihydroxy benzene (II) 1,3-dihydroxylbenzene (III) 1,4-dihydroxy benzene (IV) Hydroxyl benzene The increasing order ofboiling point of above mentioned alcohols is

(I) 1,-dihydroxy benzene (II) 1,3-dihydroxylbenzene (III) 1,4-dihydrox

1.	(I) 1,-dihydroxy benzene (II) 1,3-dihydroxylbenzene (III) 1,4-dihydroxy benzene (IV) Hydroxyl benzene The increasing order ofboiling point of above mentioned alcohols is
Answer» <P>` I lt II lt III lt IV` `I lt II lt IV lt III` `IV lt I lt II lt III` `IV lt II lt I lt III` 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`o lt m lt p` -isomers IntramolecularH-bonding `o gt m gt p`-isomers HYDROXY benzene do not form a chain of H-bondingHence, intermolecular H-bond is stronger then intramolecular H-bond , so the stability of 1,4-dihyroxy benzene is highest . Hence, its boiling point is highest . The increasing order of the boiling points of the given compounds is `IV lt I lt II lt III`