exemption procedure in case of sale of long term asset land

Exemption u/s 54F
If you are using your entire sale proceeds to buy a house property you may end up paying no tax on your gains.

By Investing in Capital Gains Account Scheme
 If you have not been able to invest your capital gains until the date of filing of income tax return (usually 31st July) then you are allowed to deposit your gains inCapital Gains Account Scheme,And claim this as an exemption from your capital gains, you don’t have to pay tax on it

Section 54EC
you can still save the tax on your capital gains, by investing them in certain bonds NHAI/REC within 6 month from the date of transfer/sale.