Question

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.

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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