Which of the following reactions involve both a chemical and physical change? Question 3 options:

CO (g) + 2H2 (g) → CH3OH (l) (methanol formation)

CO (g) + H2O (g) → CO2 (g) + H2 (g) (the water gas shift reaction)

2C2H6O (g) + O2 (g) → 2C2H4O (g) + 2H2O (g) (the oxidation of ethanol to form acetaldehyde—the compound that causes you to feel a “hangover”.)

All of the above.

None of the above.