Under the doctrine of election, when A gives his property to B and purports to give B's property to C,…

Under the doctrine of election, B must choose: he may take A's gift and let his own property pass to C, or keep his own property and forgo A's gift. Section 35 of the Transfer of Property Act, 1882 puts it as a duty to "elect either to confirm such transfer or to dissent from it", so he may not take both, and nothing obliges him to give both properties to C.