35. For the formation of an iron alkene complex shown below, what is the role of [CPh₃]BF₄?(A) Hydride scavenger (B) Brønsted base (C) Catalyst (D) Brønsted acid (E) Hydrogen scavenger

4. Both ZnS and CaF₂ have a face-centered cubic unit cell where the S²⁻ and Ca²⁺ ions are closest packed in each structure. Which of the following is true? (A) There are 4 tetrahedral holes empty in each structure. (B) In both compounds, one-half of the tetrahedral holes are filled. (C) In both compounds, all the tetrahedral holes are filled. (D) There are 8 Zn²⁺ ions and 4 F⁻ ions in the unit cell. (E) In ZnS, one-half of the tetrahedral holes are filled by Zn²⁺ ions, whereas in CaF₂ all the tetrahedral holes are filled with F⁻ ions.

35. For the formation of an iron alkene complex shown below, what is the role of [CPh₃]BF₄?

(A) Hydride scavenger
(B) Brønsted base
(C) Catalyst
(D) Brønsted acid
(E) Hydrogen scavenger

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