CH4 on complete oxidation in the presence of Cu as catalyst under 200 atm yield:

Explanation

The complete oxidation of methane in the presence of a copper catalyst at high pressure (200 atm) leads to the formation of methanol. This is due to controlled oxidative conditions that favor the formation of methanol rather than proceeding to full combustion, which would result in carbon dioxide and water.Option A is correct because methanol is the target product under the given reaction conditions. Option B is incorrect as formaldehyde is an intermediate oxidation product of methanol, not directly from methane. Option C is incorrect as formic acid results from further oxidation of formaldehyde. Option D is incorrect because carbon dioxide forms from complete combustion, not the controlled oxidation process described.