Chemical Engineering

That depends on which country you are planning for. And UG alone will not provide you good package, you need to have Masters for that and that too from abroad.

Both of these are low-grade colleges, you can select any as per your perspective.
Rather this I would prefer you to go ahead in animation field if you have an interest because it will have a bright future.

IIT Powai is the best engineering institute for studies in chemical engineering. You may refer to following link for list of top chemical engineering colleges in India: https://www.shiksha.com/b-tech/ranking/top-chemical-engineering-colleges-in-india/52-2-0-0-0

Hi Salahuddin,
Here are the best colleges in India to offer mechanical engineering:
https://www.shiksha.com/b-tech/ranking/top-mechanical-engineering-colleges-in-india/48-2-0-0-0
Here are the best colleges in India to offer chemical engineering:
https://www.shiksha.com/b-tech/ranking/top-chemical-engine

If you want a better campus than Invertis is good but in comparison in academic then SRM is good.

Yes, you can do it. It all depends on your MH-CET score and MIT's cutoff for chemical engineering branch.

You say, you have a Diploma in mechanical but you want to go for a chemical engineering degree but my advise you to think before taking this step. Are you really passionate about chemical engineering? If yes then go ahead, if not then think what you are passionate about.