Could I write a review paper as my B.Tech (Bachelors in Technology) final year project, rather than presenting an experiment based work? I live in India.
Currently due to the coronavirus pandemic, all colleges have been shut down and the country has gone in lockdown. As a result, my final year project work on electrocoagulation has come to a standstill.
The apparatus and the materials took time to arrive, and when they finally did and I was beginning to do the experimental work, the colleges were shutdown. 
In the light of these events, my mentor has suggested me to write a review paper instead, however I am afraid it might not be accepted as a final year project.
Therefore, for my own peace of mind, I would like to know if a review paper could work as a final year B.Tech project.
You should check the official site of your university and see if you get the solution for your question otherwise you can ask your mentor or guide for research and they will help you for sure. 
It is probably possible that they will allow you to write a review paper, rather than doing a final year project because the system is totally based on credits and credits are nothing but the amount of hours you put in to get a credit and writing a review paper is a difficult job and needs lots of hours to do , so I think they will allow you to that.