What is formed when glycerol reacts with $HI$?

An organic liquid $A$ containing $C$,$H$,and $O$ has a pleasant odour with a boiling point of $78\ ^\circ C$. On boiling $A$ with conc. $H_2SO_4$,a colourless gas is produced which decolourises bromine water and alkaline $KMnO_4$. One mole of this gas also reacts with one mole of $H_2$. The organic liquid $A$ is:

Alcohols of low molecular weight are

Lucas test is used for:

Methylated spirit is

Write about the production,physical properties,uses,and denaturation of ethanol.