Hello Junaid,

previous year , Closing rank for M.Sc. in IIT Delhi was AIR 92 in General Category, AIR 298 in case of OBC Category. So if you belong to OBC Category, then there are high possibilities that you can get admission in M.Sc. in Chemistry from IIT Delhi. 

if you fail to get into IIT Delhi, then you can get other IITs easily.

All the Best.