List of top Physical Chemistry Questions on Spectroscopy

The rotational spectrum of HF has equally spaced lines that are 40.9 cm$^{-1}$ apartThe moment of inertia of HF is $Y \times 10^{-47}$ kg m$^2$The value of Y is _ _ _. (rounded off to three decimal places)

The number of normal modes of vibration in benzene is _ _ _. (answer in integer)