Discussion
The molecule XY2 is microwave active and its vibration-rotation spectrum shows only P and R transitions. In the correct structure,
Answer: C
The structure is Y as the central atom in linear XY2, that is X-Y-Y.
A vibration-rotation spectrum with only P and R branches and no Q branch is characteristic of a linear molecule (parallel bands). Being microwave active, the molecule must also have a permanent dipole moment.
A linear molecule with X in the middle, Y-X-Y, would be centrosymmetric and have no dipole, so it would be microwave inactive (like CO2). The unsymmetrical linear arrangement X-Y-Y has a dipole, as N2O (NNO) does. Bent molecules show a Q branch in their vibration-rotation bands, which rules out both bent options.
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