StudentAidUnit 29: Spectroscopy-1 — Mcqs
12th Class Chemistry · Unit 29: Spectroscopy-1
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Q1.I.Which of the following compounds could produce the IR spectrum shown below? [IR spectrum: Transmittance (%) on the y-axis (0 to 100), Wavenumber (cm⁻¹) on the x-axis running from 4000 down to 500. The trace shows a broad, deep absorption trough labelled X spanning roughly 3300–2500 cm⁻¹, dropping almost to 0% transmittance, and a second sharp, deep absorption trough labelled Y at about 1700–1750 cm⁻¹.]
Q1.II.What is the wavelength range of the UV spectrum?
Q1.III.The λ of σ to σ* transitions lies in the
Q1.IV.The types of transitions possible in UV-visible region for a compound with molecular formula C₂H₄ are:
- a n→π*
- b n→σ*
- c σ→σ*
- d π→π*