Among the following alkyl halides, choose the one with the lowest boiling point.

There is an increase in boiling point as we move from chloride to a bromide to an iodide (for a given number of carbon atoms) is because of the increase in the number of electrons leading to larger dispersion forces. The boiling point decreases with the increase in branching in the alkyl group, because with branching the molecule attains spherical shape with less surface area. As a result, interparticle forces become weaker. Hence, the lowest boiling point will be of t-butyl chloride. Reaction of Alkyl Halides 100. Benzene reacts with n-propyl chloride in the presence of anhydrous AlCl3 to giv