Which is the functional group in propanone?

An aldehyde as well as a ketone can be represented by the same molecular formula,say $C_{3}H_{6}O$. Write their structures and name them. State the relation between the two in the language of science.

Mention four characteristics which change with increasing molecular mass in a homologous series.

$A$ compound $X$ is formed by the reaction of a carboxylic acid $C_{2}H_{4}O_{2}$ and an alcohol in the presence of a few drops of $H_{2}SO_{4}$. The alcohol,upon oxidation with alkaline $KMnO_{4}$ followed by acidification,gives the same carboxylic acid as used in this reaction. Give the names and structures of $(a)$ carboxylic acid,$(b)$ alcohol,and $(c)$ the compound $X$. Also,write the chemical reaction.

$A$ person who is habituated to drinking alcohol is given a medicine called $......$

Which of the following is the use of acetic acid?