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The mechanism of the Heck reaction is shown below.

i. Which of the five labeled steps of the mechanism is an oxidative addition reaction?

ii. Which of the five labeled steps of the mechanism is a ligand insertions reaction?

iii. What is the electron count for palladium compound (III)?
(A) 14 (B) 15 (C) 16 (D) 17 (E) 18

iv. What is the electron count for Palladium compound (IV)?
(A) 14 (B) 15 (C) 16 (D) 17 (E) 18