List of top Physical Chemistry Questions on Spectroscopy

Among the following, the one for which the infrared active vibrational modes are Raman inactive and vice versa is

A 0.005 M solution of compound X transmits 80% of the incident light of wavelength (\(\lambda\)) 500 nm. The absorbance of 0.01 M solution of X is (rounded off to three decimal places).
(Given: path length = 1.0 cm)

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)