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The rotational partition function for a diatomic molecule of moment of inertia $$I$$ at a temperature T is given by

The rotational partition function for a diatomic molecule of moment of inertia $$I$$ at a temperature T is given by Correct Answer $$\frac{{2I{k_B}T}}{{{\hbar ^2}}}$$

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In the above:
The parallel axis theorem can add any angle varied moment of inertias to give the perpendicular moment of inertia and it can be used in the determination of the moment of inertia about inclined axis.