Definition of ketone

Ketones are compounds in which the carbonyl group is linked to two hydrocarbon groups. Ketones can be divided into aliphatic ketones, alicyclic ketones, aromatic ketones or saturated ketones and unsaturated ketones according to the different hydrocarbon groups in the molecules. The carbonyl group of aromatic ketone is directly connected to the aromatic ring; The carbonyl group embedded in the ring is called intracyclic ketone. According to the number of carbonyl groups, it can be divided into monoketone, binary ketone and polyketone. In monoketones, the two carbonyl groups connected by the same carbonyl group are called monoketones, such as acetone (dimethyl ketone). Different from each other are mixed ketones, such as acetophenone (phenyl methyl ketone). No hydrogen bond can be formed between ketone molecules, and its boiling point is lower than that of corresponding alcohol, but carbonyl oxygen can form hydrogen bond with water molecules, so low carbon number ketones (low-grade ketones) are soluble in water. Generally, low-grade ketones are liquid with pleasant smell, and high carbon number ketones (high-grade ketones) are solid