Here, bromoethane is water insoluble compound with density 1.47 g/mL. The denisty of water is 0.9982 g/mL. If 50 mL of bromoethane is added in the separating funnel followed by 50 mL of water, bromoethane being denser than water settle at the bottom resulting formation of two layers.
Thus, there will be two layers, first layer is of water (due to lower density) and second layer is of bromoethane (due to higher density).