Which of the following is NOT a characteristic of carbon monoxide?

Carbon monoxide is a notable byproduct of incomplete combustion and has several important characteristics. It is indeed odorless, which means it cannot be detected by smell, making its presence particularly hazardous. Additionally, carbon monoxide is colorless, providing no visible indication of its presence in the environment, which further contributes to the danger it poses. Furthermore, it is classified as a toxic gas because it can interfere with the body's ability to transport oxygen, which can lead to serious health consequences or even death.

The characteristic stating that carbon monoxide is highly reactive is not accurate when considering its properties. Carbon monoxide is relatively stable under standard conditions and does not readily engage in reactions with other substances. While it can participate in some reactions, particularly when facilitated by certain catalysts or under specific conditions, it does not fit the typical description of a highly reactive substance. This clarity on its chemical nature is crucial for understanding how to recognize and manage risks associated with carbon monoxide exposure in various contexts, especially in the use of combustion appliances.