Final answer:
The correct match is option 2: Brouillis - the result of the first Cognac distillation. The other terms are mismatched to their definitions related to parts of the Cognac production process.
Step-by-step explanation:
The correct term properly matched with its definition in the context of Cognac distillation is option 2: Brouillis - the result of the first Cognac distillation. During the Cognac production process, the wine undergoes two separate distillation movements. The first distillation results in the brouillis, a liquid with about 28-32% alcohol. The other options are incorrect. The term col de cygne, which translates to "swan's neck," actually refers to the long, curved neck of the still, not a device to pre-heat the wine. The chauffe-vin is indeed a device used to pre-heat the wine before distillation, not the bulbous neck of the Cognac still. Lastly, the chaudière is a term that can refer to the boiler or heating apparatus, not specifically the traditional pot still which is referred to as an alambic charentais.