Green chemistry in day-to-day life is in the use of:

Chlorine gas was used earlier for bleaching paper. These days, hydrogen peroxide $\left({H}_{2}{O}_{2}\right)$ is used with suitable catalyst.

Tetrachloroethene $\left({Cl}_{2}C = {CCl}_{2}\right)$ was earlier used as solvent for dry cleaning. The compound contaminates the ground water and is also a suspected carcinogen. Replacement of halogenated solvent by liquid ${CO}_{2}$ will result in less harm to groundwater. Hence, given statement $( 4 )$ is correct.