Fehling's solution is reduced to a red precipitate of copper one oxide by

Explanation

Aliphatic aldehydes such as ethanal reduce the blue copper two complex to a brick red precipitate, whereas ketones do not react at all. Aromatic aldehydes such as benzaldehyde are the notable exception, since they give a negative result with Fehling's solution although they do respond to Tollens reagent. Ethanol must first be oxidised to an aldehyde before it could react.