Why is carbon monoxide (CO) poisonous for hum | vedclass

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(D) If a person breathes air containing a normal amount of oxygen $(21 \%)$ and a small amount of carbon monoxide,they suffer from suffocation because

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Haemoglobin combines with carbon monoxide instead of oxygen,and the product cannot dissociate

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(D) If a person breathes air containing a normal amount of oxygen $(21 \%)$ and a small amount of carbon monoxide,they suffer from suffocation because haemoglobin combines with carbon monoxide to form a stable compound known as carboxyhaemoglobin.The affinity of haemoglobin for carbon monoxide is about $250$ times greater than its affinity for oxygen.Even $0.1 \%$ of carbon monoxide can block $50 \%$ of the body's haemoglobin,significantly decreasing the oxygen-carrying capacity of the blood.This condition,which leads to oxygen deprivation in tissues,is called hypoxia.

Why is carbon monoxide $(CO)$ poisonous for humans?

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