The correct order of decreasing boiling points of following alcohols is
(I) 1-Pentanol
(II) 2-Methyl-2-butanol
(III) 3-Methyl-2-butanol

Options

A. `I gt III gt II`
B. `I gt II gt III`
C. `III gt II gt I`
D. `II gt III gt I`

Answer

A

Explanation

`underset("1-Pentanol(I)")(CH_(3)-CH_(2)CH_(2)CH_(2)OH)`, `underset("2-Methyl-2-butanol(II)")(CH_(3)-underset(OH)underset(|)overset(CH_(3))overset(|)(C)-CH_(2)-CH_(3))`, `underset("3-Methyl-2-butanol(III)")(CH_(2)-overset(OH)overset(|)(CH)-overset(CH_(3))overset(|)(CH)-CH_(3))`
More the surface area of the molecule (lesser the branching) more is the boiling point. Therefore correct order of decreasing boiling point is
`I gt III gt II`