The key feature of Bohr's thoery of spectrum of hydrogen atom is quantization of angular momentum when an electron is revolving around a proton. We will extend this to a general rotational motion to find quantized rotational energy of a diatomic molecule assuming it to be rigid. the rule to be applied is Bohr's quantization condition.
It is found that the excitation frequency from ground to the first excited state of rotation for the CO molecule is close to $\frac{4}{\pi }\times {10}^{11}Hz$. then the moment of inertia of CO molecule about its centre of mass is close to (Take $h=2\pi \times {10}^{-34}Js$)

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