Presented with three pairs of related carbonyl-containing molecules, identify th

Question

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.) 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 slightly higher stretching frequency than 1700 cm-1 slightly lower stretching frequency than 1700 cm-1 cinnamic acid butanoic acid hept-3-en-2-one heptan-2-one but-2-enoic acid 3-phenylpropanoic acid

Explanation / Answer

Cnjugation decreases C=O strehcing frequency since conjugation decreases C=O bond strength.

Among given compounds compounds with slightly higher streching frequency than 1700 cm-1

are butanoic acid , heptan-2-one, 3-phenyl propanoic acid

Among given compounds with slightly lower frequency than 1700 cm-1   are

cinamic acid , hept-3-en-2one , but-2enoic acid ,

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