Orbital picture of the allyl radical

We indicate with dashed lines that both carbon-carbon bonds are partial double bonds. This accommodates one of the things that molecular orbital theory tells us that there is a Tt bond encompassing all three atoms. We also place the symbol y beside the Cl and C3 atoms. This presentation denotes a second thing molecular orbital theory tells us that electron density from the unpaired electron is equal in the vicinity of C1 and C3. Finally, implicit in the molecular orbital picture of the allyl radical is this the two ends of the allyl radical are equivalent. This aspect of the molecular orbital description is also implicit in the formula just given. 

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