For 10 points, name this type of bond that consists of a sigma bond and a pi bond and is found in conjugated compounds, such as carbonyls and alkenes.
Large proton coupling constants can help to distinguish between isomers caused by these interactions. In NMR, these bonds create anisotropic effects because they shield perpendicular to themselves and de-shield in the parallel direction. One of the most notable IR peaks occurs near 1700 inverse centimeters due to the stretching of one of these bonds. Compounds with alternating versions of these bonds are commonly studied in UV-vis spectroscopy because more of these bonds shift the absorption maxima to lower frequencies. They cannot appear near the (*) bridgehead of a bridged ring system according to Bredt's rule, and they do not appear in saturated compounds. For 10 points, name this type of bond that consists of a sigma bond and a pi bond and is found in conjugated compounds, such as carbonyls and alkenes.
Large proton coupling constants can help to distinguish between isomers caused by these interactions.
double bonds [or carbon-carbon double bonds; or carbon-oxygen double bonds] &lt;Garg&gt;