Capital gain exemption on Property sale

I am currently living in a self owned flat. I also booked new under construction flat in 2016 for which I am going to get possession in 2022. My plan is to sell existing property in 2022 and move to new property.

Query1 - Can I claim capital gain exemption under section 54 on my old Property sale as I am selling old flat and taking possession/registering new flat in same year (although I have booked it in 2016)?

Query2 - Can I claim pre construction interest rebate on new flat?