Question

Which of the following forms stable compound with haemoglobin?

• A. $O_2$
• B. $C{O}_2$
• C. $CO$
• D. All of the above

Answer 1

The correct option is C $CO$

Carbon monoxide is an atmospheric pollutant present in vehicular exhaust and cigarette smoke. Carbon monoxide is a poisonous gas and reduces oxygen carrying capacity of blood. One molecule of hemoglobin combines with four molecules of carbon monoxide to form carboxyhemoglobin. The colour of carboxyhemoglobin is cherry red.