19. In the tungsten complex W(CCMe₃)(CHCMe₃)(CH₂CMe₃)(dmpe) where dmpe =
Me₂PCH₂CH2PMe₂, the CHCMe₃ ligand is
(A) a pure σ donor
(B) a pure π acceptor
(C) a σ donor and a π donor
(D) a σ donor and a π acceptor
(E) none of the above

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