Sketch the molecular orbitals for the pentadienyl system in order of ascending energy (see Figures 14-2 and 14-7). Indicate how many electrons are present, and in which orbitals, for (a) the radical; (b) the cation; (c) the anion (see Figures 14-3 and 14-7). Draw all reasonable resonance forms for any one of these three species. 

Figure 14-2, 14-3, & 14-7

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Two nodes T3, antibonding Node E T2, nonbonding No node T1, bonding Figure 14-2 The three a mole- cular orbitals of 2-propenyl (allyl), obtained by combining the three adjacent atomic p orbitals.