Why does boron trifluoride not react with methane?

Answer 1

Boron Trifluoride has only 6 electrons in it's outer shell, and is more stable with 8. Therefore, it will react with molecules that have a free electron pair. Methane does not have a free pair, so it doesn't react.

Answer 2

Boron trifluoride does not react with methane because the C-H bonds in methane are relatively strong and do not easily break. Additionally, boron trifluoride is a Lewis acid while methane is a nonpolar molecule, so there is no strong electrostatic interaction or chemical reaction between them.