If there is a very strong peak between 1640 and 1850 cm 1 there is most likely a carbonyl function in the molecule. In physical and analytical chemistry infrared spectroscopy ir spectroscopy is a technique used to identify chemical compounds based on the way infrared radiation is. Beta carotene with its system of 11 conjugated double bonds absorbs light with wavelengths in the blue region of the visible spectrum while allowing other visible wavelengths mainly those in the red yellow region to be transmitted.
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