how cfc reaches stratosphere although the V.D is more

Hiii sheo

CFCs in the atmosphere exist as gases. Gases have rather weak intermolecular attractions and they exhibit the property of diffusion -- that is, their molecules are in incessant vibrational, rotational, and translational motion. Even though their densities are greater than that of air, CFCs will ultimately mix with and diffuse about in air. In time, some will reach the uppermost parts of earth's atmosphere.

I hope this is clear to you now ...that instead of having High VD it reaches top of the atmosphere ..

Regards

Yagya

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