Question

How do ketone smells?

Answer 1

Hint: Ketones are the functional group where carbon is attached to the oxygen by a double bond and two alkyl groups are present. In ketone no hydrogen is directly attached to the carbonyl carbon. Example is acetone which is a very good solvent and used in nail polish remover.

Complete step by step answer:
Ketone is one of the carbonyl functional group (the other carbonyl functional group of aldehyde) which is given as ${R_2}C = O$ R where R is the alkyl group and a carbon atom is bonded to the oxygen atom by a double bond and two alkyl group on both the side.
According to the rules of IUPAC nomenclature, the suffix of alkane –ane is changed to –anone while naming the ketones. The position of the carbonyl group is denoted by a number.
The simplest and the most important ketone is the acetone. The chemical formula of acetone is $C{H_3}COC{H_3}$. Acetone is a liquid with a sweet odour. Acetone is soluble in all proportions in water and it can be dissolved in many organic compounds. Acetone has a very lower boiling point that is 56 degree Celsius. It is easy to remove it by evaporating when it is not needed. The acetone is the most important industrial solvent which is used in paints, vanishes, resins and nail-polish removers.
Thus, ketones have very sweet odour.

Note: ketones are present in several sugars and in medicines like natural and synthetic steroid hormones. The molecule present in the anti-inflammatory agent cortisone comprises three ketone groups.