Which of the following pollutants is the main product of automobile exhaust?A. COB. C{O_2}C. NOD. Hydrocarbons

The main pollutant found in automobile exhaust is carbon monoxide (CO), which makes option A the correct answer.

Explanation:
Carbon monoxide (CO) is produced by incomplete combustion of fuel in internal combustion engines, which occurs when there is insufficient oxygen for complete combustion. It is a toxic gas and is one of the major components of vehicle emissions.

Carbon dioxide (CO₂) is also produced in the exhaust, but it is the result of complete combustion of fuel. Although it's a greenhouse gas, it is not the main pollutant from an environmental or health perspective.

Nitrogen oxides (NOx) are produced due to the high temperature and pressure inside engines, but they are not the primary pollutant in typical vehicle exhaust.

Hydrocarbons are unburnt fuel molecules that escape in the exhaust. They contribute to air pollution but are not the main product of exhaust gases.

Thus, the main pollutant produced by automobile exhaust is carbon monoxide (CO).