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.

An atom of an element contains six electrons in its valence shell. This element is the second major component of air. It exists as a diatomic molecule.
$(i)$ Identify the element.
$(ii)$ Show the bond formed between two atoms of this element.
$(iii)$ Write the nature of the bond between the two atoms.

Explain why washing clothes with hard water is not effective.

Write true or false for the following statement:
Like mineral acids,ethanoic acid reacts with a base such as sodium hydroxide to give salt (sodium ethanoate or sodium acetate) and water.

The molecular formula of $A$ is $C_{10}H_{18}$ and $B$ is $C_{18}H_{36}$. Name the homologous series to which they belong.

What is the molecular formula of formic acid (methanoic acid)?