Question:
The IR spectrum of water shows three bands. How many bands do you predict for CO2 (a linear triatomic molecule)?
The IR spectrum of water shows three bands. How many bands do you predict for CO2 (a linear triatomic molecule)?
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Count only the IR-active fundamental vibrational modes, keeping degeneracy in mind.
Updated On: Jul 3, 2026
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The Correct Option is B
Solution and Explanation
Step 1: CO2 linear, N=3: 3N-5=4 vibrational modes.
Step 2: Modes: symmetric stretch, asymmetric stretch, doubly degenerate bend.
Step 3: Symmetric stretch keeps dipole zero, IR inactive.
Step 4: Asymmetric stretch + degenerate bend (1 band) are IR active.
Step 5: Total 2 distinct IR bands.
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