What highly poisonous gas is produced from incomplete combustion of carbon?

The correct answer is carbon monoxide, which is a highly poisonous gas produced from the incomplete combustion of carbon-containing materials. When fuels such as wood, coal, natural gas, or gasoline do not burn completely, they release carbon monoxide into the atmosphere. This gas is particularly dangerous because it is colorless, odorless, and tasteless, making it difficult for people to detect its presence without the use of specialized equipment.

Carbon monoxide binds with hemoglobin in red blood cells more effectively than oxygen, which can lead to hypoxia, a condition where the body and vital organs are deprived of adequate oxygen. Exposure to high levels of carbon monoxide can result in symptoms such as headache, dizziness, confusion, and even death if inhaled in sufficient quantities.

In contrast, the other gases listed have different properties and sources. Methane is a primary component of natural gas and is not produced by incomplete combustion in a toxic manner. Carbon dioxide is a natural byproduct of complete combustion and is much less toxic than carbon monoxide, although excessive accumulation can lead to suffocation in confined spaces. Formaldehyde is an organic compound that can be emitted from various sources, including building materials, but it is not a direct result of incomplete combustion of carbon. Understanding the unique risks associated