In the given equation CH4(g) + O2 --> CO + 2H2, we can see that 1 mole of CH4 reacts with 1 mole of O2 to produce 1 mole of CO.

According to the question, we have 2.0 moles of CH4 and 2.0 moles of O2. Since the ratio of CH4 to O2 is 1:1, we can say that the limiting reactant in this reaction is O2. Therefore, we can only produce a maximum of 2.0 moles of CO.

Option-1 states that 2.0 moles of CO can be obtained, which is the correct answer.

Option-2 states that 0.5 moles of CO can be obtained. This is incorrect because we have an equal amount of CH4 and O2, so the limiting reactant determines the maximum moles of CO that can be obtained.

Option-3 states that 2.5 moles of CO can be obtained. This is incorrect as it exceeds the maximum limit of 2.0 moles.

Option-4 states that 4.0 moles of CO can be obtained. This is incorrect as it exceeds the