Incomplete burning of wood leads to the production of mainly carbon monoxide (CO) gas.

Explanation:

Incomplete combustion occurs when there is not enough oxygen present during the burning process. In the case of burning wood, incomplete combustion can occur if the fire is not hot enough, if there is not enough air flow, or if there is too much fuel and not enough oxygen. Incomplete combustion of wood releases a number of gases, including carbon monoxide (CO), carbon dioxide (CO2), water vapor (H2O), and other volatile organic compounds (VOCs).

Carbon monoxide (CO) is a toxic gas that is produced when there is not enough oxygen present during combustion. Carbon monoxide is odorless, colorless, and tasteless, making it difficult to detect. In high concentrations, carbon monoxide can be deadly. Carbon monoxide is produced when wood is burned incompletely because the carbon in the wood does not fully combine with oxygen to form carbon dioxide.

Conclusion:

In conclusion, incomplete burning of wood leads to the production of mainly carbon monoxide (CO) gas, which is a toxic gas that can be deadly in high concentrations. Therefore, it is important to ensure complete combustion of wood by providing enough air flow and maintaining a hot fire.