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Which effect occurs when an organic molecule absorbs infrared radiation matching a vibrational mode's frequency?

A)Increased molecular rotational energy
B)Resonance leading to bond excitation
C)Photoelectric emission of electrons
D)Fluorescence emission at a shorter wavelength

💡 Explanation

When infrared radiation matches a molecular vibration frequency, resonance occurs because the molecule absorbs the energy, exciting a specific vibrational mode, leading to bond stretching or bending. Therefore, bond excitation results, rather than increased rotation, electron emission, or fluorescence which involve other energy transfer mechanisms.

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