Correct statements regarding green chemistry

Now a days to bleach paper H₂O₂ is used in place of Cl₂ gases

In dry cleaning liquid CO₂ is used by replacing C₂Cl₄.

$100\mathrm{kg}\left({10}^5\mathrm{g}\right)\text{ water }=\frac{5\times {10}^5}{{10}^6}=0.5\mathrm{gm}$

C₂Cl₄ is used in place of H₂O₂ in dry cleaning