Question

Arrange the following compounds in the decreasing order of their boiling points.
a) Pentan-1-ol
b) 2-Methylbutan-2-ol
c) 3-Methylbutan-2-ol

Answer 1

The boiling point of a compound increase with an increase in molecular weight. Boiling points decrease with increase in branching of the carbon chain.Here pentan$-1-$ol,$2-$methyl butane $2-$ol,$3-$methylbutane$-2-$ol are isomers.So they have the same molecular mass.

But braching increases from petan$-1-$ol to $3-$ methylbuten$2-$ ol.So,the boiling point order is $a>b>c$