Question

Arrange the following in increasing order of boiling points.

i) ${\left(C{H}_3\right)}_{2}CHC{H}_{2}I$ ii) $C{H}_{3}C{H}_{2}C{H}_{2}Cl$ iii) $C{H}_{3}C{H}_{2}C{H}_{2}C{H}_{2}I$

Answer 1

Among isomeric alkyl halides, the boiling point decreases with the increase in the alkyl group, because of branching the molecule attains spherical shape with less surface area $\to$ intermolecular forces becomes weaker $\to$boiling point decreases.

$C{H}_{3}C{H}_{2}C{H}_{2}C{H}_{2}I>\left(C{H}_3\right)CHC{H}_{2}I>C{H}_{3}C{H}_{2}C{H}_{2}Cl$