1. According to sec 80G(5D), no person should make a donation in excess of Rs. 2,000 in cash. However, unlike in sec 43A(3), there is no clear mandate on whether this Rs. 2,000 limit is applicable for a day or on an aggregate basis between the donor and the donee.
2. But from a conceptual angle, the above donations should be on an aggregate basis and not on a daily basis. The overall point in making such a provision is to curb the transaction in cash which is usually high in contributing to donations to various institutions, funds or trust. This provision cannot be interpreted from a liberal angle.
3. Hence, a person cannot make a donation in excess of Rs. 2,000 in cash in a year to an institution, trust or a fund.
4. In your case the entire Rs. 6,000 will not be allowed as deductions u/s 80G.
Please correct me if the above interpretation has an alternative view.