MCA

With IT industry in slow decline phase because of outcry against outsourcing in Western countries and increased work visa restrictions, students aspiring to do MCA or BTech CS are advised to do degree from prestigious colleges which have good placement record. Students from poor and average universities are struggling to get job after MCA. Therefore, you strategy to drop one year for MCA entrance exams is a reasonable and good strategy.

No, it is not possible to do M.Sc in CS after B.Sc in chemistry. You can apply for MCA if you have done your 12th with maths as a compulsory subject.

As per your degree B.Sc in computer science, you must have to do M.Sc in computer science.

Dear,
You are not eligible as:
MCA eligibility is any graduate who has passed or appearing for the final year degree examination in any discipline (science, commerce, arts, engineering or any approved university) is eligible to apply.
Candidates must have mathematics as a subject in their 10+2 course or any one year of graduation. BCA qualified candidates can also pursue MCA.
So, I would suggest you to go for MBA course.

Yes, you are eligible for doing MCA as eligibility for MCA is +2 with maths and a graduation course. You have both. So,
good luck!

RV College of Engineering, since it's one of the top college of Bangalore.