Propane $\left({\mathrm{C}}_3{\mathrm{H}}_8\right)$ is one of the combustible components of L.P.G. Write down the combustion reaction for propane $\left({\mathrm{C}}_3{\mathrm{H}}_8\right)$.

Explain by writing a reaction, which product will be formed on heating n-butyl alcohol with concentrated sulphuric acid.

Explain with reaction why does the lime water turns milky in the reaction given below.

${\mathrm{CH}}_3\mathrm{COOH}+ {\mathrm{NaHCO}}_3\to {\mathrm{CH}}_3\mathrm{COONa}+{\mathrm{CO}}_2+{\mathrm{H}}_2\mathrm{O}$