Methanol and ethanol are the two simplest alcohols of commercial importance. Which of the statements below are correct?

• Statement I: Methanol is made by catalytic hydrogenation of carbon monoxide.
• Statement II: Fermentation of sugars to ethanol needs a steady supply of air.
• Statement III: Yeast enzymes convert sugars into ethanol during fermentation.
• Statement IV: Ethanol for industrial use is denatured by mixing it with an equal volume of water.