B.Sc Chemistry

Hi Vipul,
First you need to clear JEE Mains and then JEE Advanced. As this is the IIT Bombay admission procedure. After that:-
Eligibility criteria for JEE is as follows:
1) Students who are born on or after October 1, 1992 are eligible to apply. Candidates belonging to Scheduled Caste (SC), Scheduled Tribe (ST) and Persons with Disabilities (PwD) have been given a relaxation of 5 years.
2) Aspiring candidates should have appeared for the Class XII (or equivalent) examination for the first time in either 2016 or 2017.
3) The candidates must have secured at least 75% marks or be in the top 20 percentile in the 12th Class Examination conducted by respective boards. For SC/ST students, there shall be a relaxation of 5% in this criterion.
4) Aadhar card is mandatory for all the Indian citizens who are taking JEE.

Firstly, B.Sc. Chemistry is more related to pure Science where you focus mainly on the chemical properties, reactions and their outcomes. On a deeper level you can conceptualize the creation of new compounds being a chemist. While, B.Tech in Chemical Engineering is more of an applied Science where you debottleneck the process conceptualized by a chemist to fit to the real world scenario. You will work to construct and operate large scale equipment that scale up the laboratory scale concept for real life applications. You will more be into designing scaled up equipment for the laboratory process to become feasible in a way that they are safe and easy to operate.