Question

co + o₂ → co₂
synthesis
decomposition
single displacement
double displacement
combustion

Explanation:

Combustion reactions involve a substance reacting with oxygen. In this case, CO (carbon monoxide) reacts with O₂ (oxygen). Synthesis reactions involve combining two or more substances to form one product, but combustion is a more specific type here as it is a reaction with oxygen (a key characteristic of combustion). Decomposition is breaking down a single compound. Single and double displacement involve swapping of elements or ions which is not the case here.

Answer:

Combustion