Yes, when methane (CH₄) burns in the presence of insufficient oxygen, carbon monoxide (CO) is one of the products. This incomplete combustion reaction can be represented as:

2CH₄ + 3O₂ → 2CO + 4H₂O

Here's why this happens:

* Complete combustion: In ideal conditions, methane reacts with enough oxygen to produce carbon dioxide (CO₂) and water (H₂O):

CH₄ + 2O₂ → CO₂ + 2H₂O

* Incomplete combustion: When oxygen is limited, the combustion process is incomplete. The carbon atoms in methane don't get fully oxidized to CO₂. Instead, they form carbon monoxide (CO).

Important note: Carbon monoxide is a highly toxic gas, and its production is a major concern in situations like fires and improper ventilation during combustion.