Q.Wood spirit is

Methanol is manufactured by catalytic hydrogenation of CO and used as a solvent, denaturant, and feedstock for formaldehyde/biodiesel; but it is genuinely toxic, because alcohol dehydrogenase oxidises it in the body to formaldehyde and then to formic acid, causing metabolic acidosis and optic-nerve damage (blindness) -- unlike ethanol, which the same enzyme processes harmlessly. Ethanol is obtained by fermenting sugars with yeast's zymase enzyme ($\text{C}6\text{H}{12}\text{O}_6 \rightarrow 2\text{C}_2\text{H}_5\text{OH} + 2\t …