Presented with three pairs of related carbonyl-containing molecules, identify the relative frequency of their carbonyl infrared by sorting the pairs into two groups. (there will be three compounds per bin.) slightly higher stretching frequency slightly lower stretching frequency drag and drop the labels into the boxes to identify which of the pair will have a higher carbonyl stretching frequency relative to the other. hept-3-en-2-one 3-phenylpropanoic acid but-2-enoic acid butanoic acid cinnamic acid heptan-2-one