Assuming the temperature is held constant, how could you increase the pressure inside a container by a factor of 3

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.