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

How is scum formed?

An organic compound burns with a sooty flame. Is it a saturated or an unsaturated compound?

$(a)$ Why is hard water not suitable for washing clothes with soap?
$(b)$ Why does micelle formation take place when soap is added to water?
$(c)$ What is saponification?

Write true or false for the following statement:
Two pairs of electrons are shared between two nitrogen atoms to form a nitrogen molecule.

Draw the structure of the simplest ketone.