Current Attempt in Progress Rank the following dienophiles (from least reactive to most reactive) in terms of reactivity in a Diels-Alder reaction. ņ A Compound Compound B is the LEAST reactive dienophile, because it has is the MOST reactive dienophile, because it has no electron-withdrawing groups two electron-withdrawing groups one electron-withdrawing group

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UV Visible Spectroscopy

Spectroscopy refers to the absorption or emission of light or other radiations by matter. When a substance or chemical absorbs light or radiation, they reach an excited state followed by de-excitation or emission of the light or radiation forming distinct spectra. UV-visible spectroscopy or  ultraviolet-visible refers to the absorption and emission in the ultraviolet and visible regions of the electromagnetic spectrum.