The name of the compound $CH_{3}-CH_{2}-CHO$ is

What is the boiling point of acetic acid (in $;K$)?

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

What is meant by homologous series of carbon compounds? Classify the following carbon compounds into two homologous series and name them.
$C_{3}H_{4}, C_{3}H_{6}, C_{4}H_{6}, C_{4}H_{8}, C_{5}H_{8}, C_{5}H_{10}$

Which of the following compounds is a condensation polymer?

Esters are sweet-smelling substances and are used in making perfumes. Suggest an activity and the reaction involved for the preparation of an ester with a well-labeled diagram.