sir my rank is 1605 options available to me are iit ropar cse, iit gandhinagar cse, iit roorkee electrical engineering, iit guwahati ece
Yes, you have chances based on rank to get IITs.
To check which IITs and branches you can get based on your rank you can use below college predictor
http://www.engineering.careers360.com/jee-advanced-college-predictor
Good Luck!!