Question
How does the rule of Mutual Exclusion help in predicting the symmetry in case of and
molecules?
Answer :
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The rule of mutual exclusion states that in molecules with a center of inversion (i.e., centrosymmetric molecules), vibrational modes that are IR active are Raman inactive and vice versa. For (H_2O), the molecule is non-centrosymmetric (no inversion center), so the rule does not apply strictly. Both symmetric and asymmetric stretching vibrations can be active in IR and Raman spectra. The symmetric stretch
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