A polyatomic molecule exhibits three absorption lines at wavenumbers of ,

CHEMISTRY · Single correct · A Level · Chemistry · Organic analysis and spectroscopy · Organic analysis and spectroscopy

Problem

A polyatomic molecule exhibits three absorption lines at wavenumbers of

12\,\text{cm}^{-1}

1500\,\text{cm}^{-1}

, and

2.2\times10^{4}\,\text{cm}^{-1}

. Which option both assigns each line to the correct type of transition and orders the corresponding photon wavelengths from longest to shortest? (a)

12\,\text{cm}^{-1}

(rotational),

1500\,\text{cm}^{-1}

(vibrational),

2.2\times10^{4}\,\text{cm}^{-1}

(electronic); wavelength order: electronic > vibrational > rotational (b)

12\,\text{cm}^{-1}

(vibrational),

1500\,\text{cm}^{-1}

(rotational),

2.2\times10^{4}\,\text{cm}^{-1}

(electronic); wavelength order: rotational > vibrational > electronic (c)

12\,\text{cm}^{-1}

(rotational),

1500\,\text{cm}^{-1}

(vibrational),

2.2\times10^{4}\,\text{cm}^{-1}

(electronic); wavelength order: rotational > vibrational > electronic (d)

12\,\text{cm}^{-1}

(rotational),

1500\,\text{cm}^{-1}

(electronic),

2.2\times10^{4}\,\text{cm}^{-1}

(vibrational); wavelength order: vibrational > rotational > electronic