Capital Gain exemption?

kirti (student) (48 Points)

26 September 2019  
I own 2 plots of land(long term capital assets). I have decided to sell one plot and construct a house on another plot. Can I claim any exemption for the capital gain arising on sale of the one plot and reduce my taxes?

what if i start my construction of house before hand and then later sell the other plot?

can anyone please help?