N the reaction methane + oxygen turns into carbon dioxide + water, the methane and oxygen are called

Reactants

Explanation:

methane + oxygen turns into carbon dioxide + water

This is given as;

methane + oxygen --> carbon dioxide + water

In a reaction, all the substances before the arrow (the left side of the equation), are called Reactants!

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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.