• 1. Draw out the detailed mechanism for thereaction between (CO),Mn-CH, and PPH3 toyield (PPH3)(CO),Mn–(CO)CH3.• 2. Give the electron counts for eachorganometallic complex in the catalytic cycle forWilkinson's catalyst (given on the next slide.

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Chemistry

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

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Chapter1: Chemical Foundations

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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Answer this question starting on a new page. 5. (a) Using the 18-electron rule, predict the number of CO ligands (X, Y, Z) for the most stable form of the following organometallic species, explaining your answers, and sketch the structures of G, H, I: G RU(CO)x H CO₂(CO)Y I Na₂[Fe(CO)z] (b) In the case of species H, discuss how the presence or absence of u-CO ligands could be determined experimentally and what this would mean for the structure of the complex. (c) Treatment of I with ethyl bromide EtBr leads to the product J Na[EtFe(CO)z]. Explain what other product(s) are formed and why this is therefore a useful synthetic strategy. (d) Identify the formal oxidation state(s) of the Fe centre in species I and J. (e) What product forms from the reaction of J with excess CO?
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3. Answer ALL parts a) - c). i) State the selection rule for an IR active transition. What factor influences the intensity of an IR band? ii) With the aid of a diagram, describe the bonding between a CO ligand and a d-block transition metal ion. iii) Explain why [V(CO)6]- has a lower CO stretching frequency than [Mn(CO)]*. iv) Briefly discuss the influence that binding mode (terminal vs bridging) has on the stretching frequency of CO in coordination complexes. c) A single analysis using chromatography produced a chromatogram with three peaks. The peak for compound A has a retention time of 0.44 min, compound B of 5.86 min and compound C of 6.14 min. i) Compound A does not interact at all with the stationary phase. What information can be obtained from the retention time of A? ii) Calculate the retention factors for compounds B and C respectively. iii) Calculate the selectivity factor for compounds B and C. iv) The peaks for compounds B and C have respective widths of 0.32 min and 0.35…
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• 1. Draw out the detailed mechanism for the reaction between (CO),Mn-CH, and PPH3 to yield (PPH3)(CO),Mn–(CO)CH3. • 2. Give the electron counts for each organometallic complex in the catalytic cycle for Wilkinson's catalyst (given on the next slide.