My replies to your queries are as under:
(1) You want to claim tax exemption for home loan repayment for 1st house purchased in June 2019 with sale proceeds of ancestral house in August 2020. There is no deduction or exemption for home loan repayment for capital gains tax. But Sec 80 C provides such deduction for home loan principal amount repayment up-to Rs. 1.5 Lakhs.
(2) Investment in specified bonds (NHAI or REC) for capital gains deduction u/s 54EC is available up-to Rs. 50 Lakhs with 5 years of lock-in period.
Reply by Mukherjee is confusing since your query is not for interest deduction u/s 24 or for investment in new home. For your information, home loan interest deduction u/s 24 is as under: [a] Self-occupied property [SOP]: Rs. 2 Lakhs (increased from 1.5 L wef AY 2015-16) & (b) Rented property: Actual interest without limit