Discussion
What is Raman spectroscopy complementary to infrared for?
Answer: D
Raman scattering depends on a change in polarisability, so modes that are infrared inactive because they are symmetric are often Raman active and the reverse. Electronic transitions, spin transitions and molecular weight belong to other techniques. In a molecule with a centre of symmetry the two techniques are mutually exclusive, which makes running both a direct test of whether that symmetry is present.
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