Tax treatment on Long term capital gain

If you purchase this from recognized stock exchange and paid STT than whole LTCG will exempt from tax.

if shares are sold through Recognised Stock Exchange, then LTCG shall be exempt u/s 10(38)

otherwise taxable at 20%

Yes, he purchased from the recognised stock exchange, may be it was 10 years back,at that time no STT was charge i think. Now can he avail the tax exemtpion if he not paid STT?

Pay STT and make your LTCG tax free......