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  4. (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 the above mentioned alcohols is

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Q. (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 the above mentioned alcohols is

JEE AdvancedJEE Advanced 2006

Solution:

The structures of the given compounds are as follows:
image
We know that the boiling point increases as molecular mass increases so $IV$ has the least boiling point. Also, among the isomeric alcohols, paraisomer has the highest value of boiling point being symmetrical in nature; followed by meta- and then ortho-isomers.
Hence, the correct order of boiling points is $|V < I < II < II $.