There are only 13 electrons, so this structure does not obey The Eighteen Electron Rule. C₆H₆ is benzene, all 6 carbon atoms are bonded to the Cr. As drawn this structure has a phenylring, C₆H₅, and that is a 1e^- donor.

Cr           = 6e- 3 x COT = 6e- C6H5     = 1e-                  13e-

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