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Benzil's IR spectrum would show characteristic peaks for the following functional groups:
Carbonyl (C=O) stretch: A strong absorption band around 1680-1710 cm⁻¹ due to the presence of two carbonyl groups.
Aromatic C-H stretch: Weak absorptions in the region of 3030-3100 cm⁻¹ for the aromatic ring's C-H bonds.
Aromatic C-C stretch: A series of bands between 1450-1600 cm⁻¹ due to vibrations of the aromatic ring.