Sodium is found in group '__' of the periodic table, as a result it has '' reactions. It is also considered a '' where as chlorine is a non-metal. The symbol for sodium is '' and it has an electronic configuration of ''. and has '' electrons.

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.