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An organic compound A having the molecular formula $C_3H_8O$ is a liquid at room temperature. The organic liquid $A$ reacts with sodium metal to evolve a gas which burns causing a little explosion. When the organic liquid A heated with concentrated sulphuric acid at $170^\circ C,$ it forms a compound $B$ which decolourizes bromine water. The compound $B$ adds on one molecule of hydrogen in the presence of Ni as catalyst to forms compound $C$ which gives substitution reactions with chlorine.

1. What is compound $A?$
2. What is compound $B?$
3. What type of reaction occurs when $A$ is converted into $B?$
4. What is compound $C?$
5. What type of reaction takes place when $B$ is converted into $C?$