Multiple choice Which of the following is an aromatic aldehyde? Furan Furfural Furfuryl alcohol Furfurylamine Reveal answer Fill a bubble to check yourself B Correct answer Explanation Furfural is an aromatic aldehyde. Its chemical formula is OC4H3CHO. It is a colourless oily liquid with the odour of almonds, but upon exposure to air, samples quickly becomes yellow.