I’m having a hard time distinguishing dienes from dienophiles. I thought dienes were just hydrocarbons. (This is from my lecture notes) can someone explain how I can tell the difference if both compounds have elements other than carbon and hydrogen?

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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.