What are the two kinds of electricity? 1.positive and negative
2.weak and strong
3.north and south
4. current and static

4.Current and static electricity

Explanation:

i believe it is 40–40–20%

explanation:

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.