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19. Organometallic complexes of the late transition metals tend not to obey the 18-electron rule; many of them follow a 16- electron rule. Which of the complexes below is a 16-electron species? [2 pts]
(A)1 and 2
(B) 2 and 3
(C) 3 and 4
(D) 4 and 5
(E) 1 and 5