One of the reactions used to inflate automobile air bags involves sodium azide (NaN3): Determine the mass of N2 produced from the decomposition of NaN3 shown below.
NaN3(s) → Na(s) + N2(g)

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.