Can a non-polar molecule contain polar bonds? (use an example to explain your answer)

yes

Explanation:

Yes non polar molecules can contain polar bonds. For example CO2  O=C=O have 2 dipoles because the oxygen is more electronegative than the carbon, but because CO2 is linear and has a bond angle of 180, the dipoles cancel out resulting in a nonpolar molecule

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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.