Question

I dont understand why the answer is B
http://screencast.com/t/msTjK1DJ6
@Vincent-Lyon.Fr

Answer 1

I don't know, it has to do with the efficiency of the hydrogen bonds between molecules.
The answer should be D, but I am no expert.

Answer 2

exactly :/

Answer 3

You can check on Wikipedia if these compounds are liquid or gaseous at room temperature.

Answer 4

It says propan-1-ol is liquid and chloroethane is gaseous.
So there must be a typo in your answer key.

Answer 5

must be thanks btw :)