1. 1,000 times the base unit
centi-
2. 1/1,000,000 of the base unit
mega-
3. 1/100 of the base unit
kilo-
4. 1,000,000 times the base unit
nano-
5. 1/1,000 of the base unit
milli-
6. 1/1,000,000,000 of the base unit
micro-

um i think it might be a car?

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.