7. Below is a square planar Fe hydride complex that had the hydride resonance in the ¹H NMR spectrum to be −3560 ppm, what is the oxidation state of Fe? (A) 0 (B) +1 (C) +2 (D) +3 (E) +4

1. The Nobel Prize in Chemistry in 2022 was awarded to click chemistry, or the azide-alkyne cycloaddition to connect two molecular fragments. For their initial discovery, what metal ion was required as a catalyst for this reaction to proceed at a milder condition? (A) Cu(I) (B) Zn(II) (C) Fe(II) (D) Fe(III) (E) Mo(II)

7. Below is a square planar Fe hydride complex that had the hydride resonance in the ¹H NMR spectrum to be −3560 ppm, what is the oxidation state of Fe?

(A) 0
(B) +1
(C) +2
(D) +3
(E) +4

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