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Analyze the chloroform's point group, no. of tones, symmetry vibrations, types ir active , raman active and combination
Accepted Answer
Chloroform (CHCl3) belongs to the C3v point group. Here's a breakdown of its properties:
Number of atoms: 4
Degrees of freedom: 3N = 12
Translations: 3
Rotations: 3
Vibrations: 12 - 3 - 3 = 6
Symmetry Vibrations:
A1 (symmetric stretch): IR active, Raman active
A1 (symmetric bend): IR active, Raman active
E (degenerate stretch): IR active, Raman active
E (degenerate bend): IR active, Raman active
Types of Vibrations:
Stretching: Changes in bond length
Bending: Changes in bond angle
IR and Raman Activity:
Infrared (IR) active: Vibrations that cause a change in dipole moment.
Raman active: Vibrations that cause a change in polarizability.
Combination Bands:
Combination bands arise from the simultaneous excitation of two or more fundamental vibrations. These bands are often weaker than the fundamental vibrations and can be observed in both IR and Raman spectra.
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