$(i)$ What is vinegar? State its one use.
$(ii)$ Which gas is produced when dilute ethanoic acid is added to sodium bicarbonate? How will you test the presence of this gas?

What is the molecular formula of vinegar used as a preservative?

Write the name and structure of an alcohol with three carbon atoms in its molecule.

Draw the structures for the following compounds:
$(i)$ Ethanoic acid
$(ii)$ Bromopentane
Are structural isomers possible for bromopentane?

Vinegar is a solution of :

$A$ carboxylic acid (molecular formula $C_{2}H_{4}O_{2}$) reacts with an alcohol in the presence of an acid catalyst to form a compound $'X'$. The alcohol on oxidation with alkaline $KMnO_{4}$ followed by acidification gives the same carboxylic acid $C_{2}H_{4}O_{2}$. Write the name and structure of $(i)$ carboxylic acid,$(ii)$ alcohol,and $(iii)$ the compound $'X'$.