When formaldehyde and potassium hydroxide are heated, we get A. acetylene B. methyl alcohol C. methane D. ethyl formate

The correct answer is: D. ethyl formate

When formaldehyde and potassium hydroxide are heated, they react to form ethyl formate, a colorless liquid with a pleasant fruity odor. Ethyl formate is used as a solvent, a flavoring agent, and a fragrance.

Acetylene is a colorless gas with a garlic-like odor. It is used as a fuel in welding and cutting torches.

Methyl alcohol is a colorless, flammable liquid with a strong odor. It is used as a solvent, a fuel, and a denaturant for ethanol.

Methane is a colorless, odorless, and tasteless gas. It is the simplest alkane and the main component of natural gas.