Which statement best explains why water has a higher boiling point than ethane? ethane molecules are smaller than water and can move faster. water molecules need relatively less heat energy to move. water molecules form hydrogen bonds, which cannot be broken by heating water. ethane molecules have no hydrogen bonds and need less energy to separate.

Ethane molecules have no hydrogen bonds and need less energy to separate.

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.