Everything is dependent on your aspirations. MSc chemistry in IIT's have good recruitments rates so it is a good choice for you. If you want to shift your field then only go for MCA or keep up with chemistry. I think it will be the best for you.

This is my opinion and may be different from you. But you should conduct a research about both of the fields and then only reach a conclusion.

I hope my answer helps. All the very best for your future endeavors!