What is the molecular formula of formalin?

State the meaning of functional group in a carbon compound. Write the functional group present in $(i)$ ethanol and $(ii)$ ethanoic acid and also draw their structures.

What is the general formula for the corresponding alcohol of an alkane?

Ethanol reacts with sodium and forms two products. These are:

State whether the following statement is true or false:
Heating ethanol at $443 \,K$ with excess concentrated sulphuric acid results in the dehydration of ethanol to give ethene.

What is the reaction called in which ethanol reacts with acetic acid in the presence of concentrated $H_{2}SO_{4}$ to form ethyl acetate and water?