what is the last rank to get mechanical or chemical course in any of the iit's?what other options are available for 6000 rank?

Hi,

You can check cutoff details you can visit the following:

http://www.askiitians.com/IIT-JEE-2010-Cut-Offs.aspx

http://www.askiitians.com/iits-2009-2010-opening-and-closing-rank.aspx

for cutoff in new IITs  check the link

    (this link includes the more detail analysis)

for code of the cources check the councelling broucher 2009.

All the Best !!