Thanks All, I got the answer and reference is here below:
It will be treated as capital asset as the definition of transfer in relation to capital asset includes
(i) the sale, exchange or relinquishment of the asset; or
(ii) the extinguishment of any rights therein
Treatment in the hands of buyer
- Due to default on the part of vendor : vendee receives some compensation besides the refund of the earnest money paid by him, such compensation shall be subject to capital gains as it will amount to relinquishment of a right by the vendee. [CIT V. Vijay Flexible Container (1990)186 ITR 693(BOM) and K.R.Srinath v. Asst.CIT (2004)268 ITR 436 (MAD)].