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

What is the boiling point of pure ethanol (in $K$)?

Which polymer is formed by reacting a compound containing two carboxylic acid groups and a compound containing two hydroxyl groups?

Look at the figure and answer the following questions:
$(a)$ What change would you observe in the calcium hydroxide solution taken in tube $B$?
$(b)$ Write the chemical reactions involved in test tubes $A$ and $B$ respectively.

What is the $IUPAC$ name of formic acid?

Write true or false for the following statement:
Esters react in the presence of an acid or a base to give back the alcohol and carboxylic acid.