Which alkyl halide will have the lowest boiling point?

Question

a. t-butyl chloride
b. t-butyl iodide
c. n-butyl iodide
d. n-butyl chloride
e. t-butyl bromide
(I have narrowed it down to two...but i can not pinpoint the exact answer)

Answer 1

Straight chains tend to have higher boiling points than other isomers.

The bigger halogens tend to make the boiling point higher.

So...b.

Answer 2

N-butyl Iodide

Answer 3

it is t-butyl chloride