How carbon monoxide (CO) is formed in the internal combustion engine?

How carbon monoxide (CO) is formed in the internal combustion engine?

Options:

a. burning the fuel which contains carbon monoxide (CO)
b. incomplete combustion of the fuel
c. both a. and b.
d. none of the above

Correct Answer: b. incomplete combustion of the fuel

Explanation:

Carbon monoxide is the product of incomplete combustion in IC engine. It is produced by the partial oxidation of carbon containing compounds. Generally in combustion process carbon dioxide(CO2) is formed after combustion. But when there is not enough oxygen for the combustion process Carbon monoxide (CO) forms, that is incomplete combustion. Carbon monoxide (CO) reduces the ability to carry oxygen in the blood. At high concentration it may causes to death.