Nasir wants to enter into an exchange contract with Nisar. Nasir exchanges 10 kg dates with 15 kg of wheat. Islamic law for such transactions is:

The exchange must be on the spot only

The exchange must be in equal quantity from both sides

This exchange must be on the spot as well as in equal quantity.

Since the exchange is between different commodities, therefore, there is no requirement for it, neither the spot nor equality in quantity.