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Determine whether the number of IR and Raman active stretching modes could be used to determine...

Determine whether the number of IR and Raman active stretching
modes could be used to determine uniquely whether a sample of gas is
BF3, NF3, or ClF3.

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Answer #1

For the molecules,

BF3 without any lone par on boron would have a different set of symmetry operation and active modes for Ir and Raman when compared to NF3 with a lone pair of electron on Nitrogen. Similarly ClF3 with 3 lone pair of electrons on Cl would have a completely different symmetry operation and valid Ir and raman modes.

These features thus determine the differences between the given three gases and thus a sample of gas can easily be identified knowing the symmetry operation and Ir and Raman active modes data experimentally.

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