"alkenes" reasonably soluble in water are relatively polar compounds have lower boiling points than alcohols of similar molecular weight both have lower boiling points than alcohols of similar molecular weight and are relatively polar compounds

The answer to your question is: the third option is correct.

Explanation:

"Alkenes" .

are reasonably soluble in water This option is incorrect, alkenes are insoluble in water.

are relatively polar compounds  This option is wrong, alkenes are not polar molecules.

have lower boiling points than alcohols of similar molecular weight This option is true, alkenes have a lower boiling point than alcohols.

both have lower boiling points than alcohols of similar molecular weight and are relatively polar compounds. This option is incorrect because is combining true with false facts.

i think the answer is terrae but not 100 percent sure. ▓▬▬ §

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.