Give a name to the reaction which takes place between ethanoic acid and ethanol in the presence of concentrated sulphuric acid. Write the chemical reaction and the name of the product obtained.

Write the structural formulae of all the isomers of hexane $(C_6H_{14})$.

What is saponification? Write the reaction involved in this process.

Which of the following is the reaction occurring between alcohol and carboxylic acid in the presence of concentrated $H_{2}SO_{4}$?

Give names of the following:
$(a)$ An alcohol containing $4$ carbon atoms.
$(b)$ An acid with $5$ carbon atoms.
$(c)$ Simplest ketone. Define functional group in a carbon compound. Mention names of any three functional groups with their formulae and example.

$A$ 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.