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B.Sc (Hons) in India is generally a three years degree programme which develops advanced theoretical and research skills. It helps in building an advanced professional or academic career. It is an appropriate course for students who wish to pursue Master of Science (M.Sc) or Doctor of Philosophy (Ph.D) and a research or academic career. This programme facilitates the students to pursue an independent research project in an area of interest under the supervision of an academic staff member. http://B.Sc(general) orhttp://B.Sc(programme) or simply "http://B.Sc" courses a three-year undergraduate academic degree, designed to provide the students with foundation knowledge possible for a Science-based career. This programme facilitates a large range of career possibilities. It provides a broad foundation in the sciences, with a special focus on multi-disciplinarity. Marks Required
Forhttp://B.Sc. Honours, a candidate should have passed 10 +2 or equivalent exam with 55 to 60% with physics, chemistry, mathematics, and biology as compulsory subjects. Forhttp://B.Sc. General, a candidate must have passed class 12 with more than 55 % marks in best of four subjects. Specializations
B.Sc. (Hons) Bio-Chemistry
There are no "specializations as such. Instead, the course provides a foundation for all Science subjects such as Physics, Chemistry, Maths, Life Sciences (Biology - Zoology & Botany), Computer Science, B.Sc. (Hons) Zoology
B.Sc. (Hons) Biomedical Sciences
B.Sc (Hons) Statistics
B.Sc. (Hons) Chemistry
B.Sc. (Hons) Computer Science
B.Sc. (Hons) Botany
B.Sc. (Hons) Physics
B.Sc. (Hons) Mathematics

Qualification Criteria:
Qualifying Exam: Candidates must pass the 10+2 or equivalent examination from CBSE or any other examination within scope and standard found to be equivalent to the Senior Secondary Examination of a recognised Indian Board/university after a period of 12 years of study. The medium of instruction in the admitting university will be English. Subjects: Physics, Chemistry and any one of the subject from Biology/Home Science/Mathematics/ Agriculture are the subjects shoulod be there in the qualifying exam.
Minimum Marks: General/OBC /UPS category candidates have to obtain the 50% and 40% for SC/ST/PC category candidates.
Appearing Candidates:
Appearing candidates can also eligible but, they have to produce the proof of the qualifying examination. Candidates having a compartment/supplementary in any of the subjects will not be eligible unless proof of having cleared the examination with the requisite percentage.

You can get the right answer from some students who are pursuing this course. Generally, Bombay and Kanpur are the best ones since they give their students equal opportunities for placements. M.Sc in Chemistry students sit for placements with B.Tech Chemical. So, you do get a lot of options but competition is stiff. But these vary from IIT to IIT.
So, the student at this position can answer this question better.
I would advise you to do M.Sc from Delhi University as in IITs, there are no specialisation courses.
No IIT offers placement after M.Sc (chemistry) but yes if you are interested in doing Ph.D, you can choose any IIT (Mumbai, Delhi or Madras).