Hello , 

As your query is you are confused in between taking admission in various IIT's. 

I would like to tell you that your admission in any college depends upon only  3 things , these are as follows : 

• Branch of your choice
• College of your expectations
• Placesand facilities 

Well talking about the branch of your interest, it all depends upon your capabilities and understanding. But based on the choices provided by you , in my opinion IIT Bombay with choice of Chemical Engineering would be the best choice. Because according to survey based on various top engineering institute of world, IIT Bombay has been recognised as among the 5 best engineering college of world. 

With better infrastructure and placement value my opinion will be to go with IIT Bombay.

Further, if you have any other query regarding the same you can let me know in the comment section below.

I hope your query is solved.

Thank you.