listen cs is a very gud branch mainly highest package is given by microsoft

that is around 9.2lac salary + 8 lac of microsoft share

where as in chemical it is around 6-7 lac

but in both the cases it depends upon wat type of student r u ,ur proformance etc

the fact is that every one knows that cs is always be better branch than chem in every field

but u r getting chem at iitk which is considered as best coll of india  

both the hav gud campus and placement

rest on u