Concept:Methanol is toxic because it is converted in the liver into formaldehyde, which destroys proteins by coagulation.
Explanation:When methanol (
CH3​OH) enters the body, the liver enzyme alcohol dehydrogenase oxidizes it to methanal (
HCHO), commonly known as formaldehyde.
Formaldehyde is a highly reactive chemical that coagulates protoplasm — it denatures proteins and disrupts normal cell function.
This damage leads to serious health effects such as blurred vision, headache, dizziness, and in severe cases, coma or death.
The toxicity is not caused by methanol itself but by its metabolic product formaldehyde.
That is why ethanol is used as an antidote: it competes with methanol for the same enzyme, slowing the production of formaldehyde.
Answer:Option B (methanol gets oxidised to methanal in liver which coagulates the protoplasm).