Problem 1.17 Draw a second resonance structure for each species in parts (a), (b), and (c). Draw two additional resonance structures for the ion in part (d). a. CH3. b. E d. H H E C. H₂N B `℃´ I H CH3 H I с ci: H HH :0: .C :O: || C H `C I H :O: CH3 CH3

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Resonance structures for the "allyl carbanion" are shown below (I and II). O.. CH₂CH=CH₂ I CH CH-CH₂ II Which of the following statements regarding I and II are correct? Select one: O A. In the actual allyl carbanion, both C,C bonds are unequal in length. O B. The actual structure of an allyl carbanion is an average of structures I and II, with both resonance structures weighted equally. O C. Resonance structures I and II are nonequivalent resonance structures. O D. The energy of the actual allyl carbanion is higher than the energy expected for resonance structures I and II.

ANIC CULES Evaluating octot compliance at carbon Decide whether the proposed Lewis structure below is reasonable. proposed Lewis structure Is this a reasonable structure? O Yes H. O No H. H. H O Yet O No H. C=C=C O No H. H. O Yes O No H.