👉 A diol is a type of compound consisting of one or more identical carbon atoms bonded to different hydroxy groups. In other words, it's an organic molecule that contains two or more carbons and can be made up of two or more hydroxyl groups. The structure of a diol can vary greatly depending on the number of hydroxyl groups present. Examples of diols include propene (CH3CH2CH2CH3), naphtha (C6H14