AIIMS 2014 Chemistry Chemical Compounds MCQ Question

The correct answer is B) PH3 because phosphine (PH3) has a bent molecular geometry due to the presence of a lone pair on the phosphorus atom. This shape allows for the formation of vortex rings, which are structures that can arise from the way the gas disperses in a fluid medium, particularly when influenced by its molecular configuration and interactions. In contrast, the other options have different geometries that do not facilitate vortex ring formation.