No, it does not. Very few (if any) compounds that would be suitable for use in organisms would be able to withstand large amounts of chlorine gas.
Of course, looking at it realistically, it is unlikely for any organisms to be based off of anythign other than carbon or silicon. I only say silicon because there are a few types of Monerans that have heavy amounts of silicon in them. But anyways, carbon (and maybe silicon) is the only element that can form the types of huge, complex molecules necessary for functional organisms, by forming huge chains of carbon molecules bonded to each other, and then having 2 more possible electron pairs to hafe other elements (or maybe even more carbon) bonded to them. Even artificial pLastic polymers and such are based off of carbon chains. So, any planet with life on it would have to have relatively huge amounts of carbon (or maybe silicon). All natural life would be carbon- (or maybe silicon-) based.
Re: Atmospheres
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