capital gain

Exemption u/s 54-F shall be allowed if following conditions are fulfilled.

(i)         The assessee is only an individual or a H.U.F.

(ii)        The assessee does not own more than one residential house on the date of transfer of the above mentioned assets.

(iii)       The assessee transfers above mentioned asset or assets (other than a residential building) and there is a long term capital gain.

(iv)       The assessee invests the net sale consideration of above mentioned assets to construct a residential house within 3 year of the sale of the asset or purchases an already built house within one year before or two years after the sale of the above mentioned asset.

(v)        The assessee is required not to purchase another residential house with in a period of one year after or constructs within a period of 3 year after the date of transfer of the above mentioned asset/assets. 

Refer: https://www.caclubindia.com/articles/capital-gains-exemption-from-tax-u-s-54-54f-23471.asp