If a hydrocarbon reacts with a diatomic molecule of oxygen would it be a combustion, synthesis, or single or double replacement reaction?

Say the two are isolated in a certain area and it’s hot enough to get them to collide. I think you’d get HCO2. So synthesis. And I’ve read that HCO2 has to do with, “The Lewis Structure.”

I’d try e-mailing a chemistry, physics or an astronomy professor if I were you.

Thanks.

I haven’t studied this stuff in a long long time, but doesn’t a hydrocarbon and O2 with heat cause combustion? That’s how an internal combustion engine works. The result is water and carbon dioxide.

Please educate me if I am wrong.