What is the molecular formula of ethanol?

How would you distinguish experimentally between an alcohol and a carboxylic acid?

Why is the conversion of ethanol to ethanoic acid an oxidation reaction?

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

The correct structural formula of butanoic acid is

$A$ compound $C$ (molecular formula $C_2H_4O_2$) reacts with $Na$ metal to form a compound $R$ and evolves a gas which burns with a pop sound. Compound $C$ on treatment with an alcohol $A$ in the presence of an acid forms a sweet-smelling compound $S$ (molecular formula $C_3H_6O_2$). On addition of $NaOH$ to $C$,it also gives $R$ and water. $S$ on treatment with $NaOH$ solution gives back $R$ and $A$. Identify $C$,$R$,$A$,$S$ and write down the reactions involved.