What legal term describes the obligations of both parties in a synallagmatic contract?

The correct term that describes the obligations of both parties in a synallagmatic contract is "Reciprocal Obligations." In a synallagmatic contract, each party commits to fulfilling a specific duty or obligation that corresponds to the obligation of the other party. This creates a mutual relationship where each party benefits from the performance of the other's obligations. For example, in a sales contract, the seller must provide the goods, while the buyer must pay the agreed price. This reciprocal nature is fundamental to the concept of synallagmatic contracts, as it emphasizes the interconnectedness of the obligations and ensures that both parties are engaged in the transaction.

The other terms listed do not apply to the concept of obligations within synallagmatic contracts. Usufructuary rights refer to the rights to use and enjoy the benefits of someone else's property without damaging it. Negative servitude pertains to a situation where a property owner agrees not to do something that could impair another property owner’s rights. Expropriation refers to the government taking private property for public use, characterized by compensation to the owner. None of these concepts reflect the mutual obligations that characterize synallagmatic contracts, making "Reciprocal Obligations" the accurate term.