$A$ person who is habituated to drinking alcohol is given a medicine called $......$

$A$ gas is evolved when ethanol reacts with sodium. Name the gas evolved and also write the balanced chemical equation of the reaction involved.

$(a)$ Give chemical tests to detect the presence of:
$(i)$ Ethanol
$(ii)$ Ethanoic acid
$(b)$ Why is ethanoic acid called glacial acetic acid?

$(i)$ What is vinegar? State its one use.
$(ii)$ Which gas is produced when dilute ethanoic acid is added to sodium bicarbonate? How will you test the presence of this gas?

Which of the following compounds is obtained by the fermentation reaction of molasses?

Ethene is formed when ethanol at $443\, K$ is heated with excess of concentrated sulphuric acid. What is the role of sulphuric acid in this reaction? Write the balanced chemical equation of this reaction.