1. D owes C P1,000. D proposed to C that T would substitute him as debtor. C agreed to the proposal. If at the time of the delegacion, T was already insolvent. Determine the liability of D.

2. A is indebted to B. Upon learning that B is going to enforce his credit, A pretended to sell his land C, his father-in-law. A did not receive a single centavo for the transaction and he continued in possession of the land. Was there a valid contract of sale?