In Avogadro's Law, pressure and volume: A)vary depending on the number of moles present

B)are not important in this law

C)change by a designated ratio

D)are constant

if you mean hydrogen and oxygen then water is the product

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.