If in the following mechanism, the entering Y ligand could not follow the top path but follows the middle and bottom paths with equal probability, what percent of the product complex will consist of the trans isomer?  Group of answer choices 66.67% 100% 50% 33.33%

d) H3PO4 + 5 HBr PBrs + 4 H20 e) 3 Fe(OH)2 + 2 H3PO4 Fe(PO4)2 + 6 H2O f) 2K + Br2 2 KBr Teve Closed - enerqy ISolu

The first observation that this reaction is not a typical ligand substitution was the dependence on the pKb of the incoming ligand (using alkoxides) on the rate of substitution. It has been hypothesized that this is a base-hydrolysis mechanism. The key steps are shown below.   [CoCl(NH3)5]2+  +  OH–  →  [CoCl(NH2)(NH3)4]+                (1) [CoCl(NH2)(NH3)4]+  →  [Co(NH2)(NH3)4]2+  +   Cl–                  (2) [Co(NH2)(NH3)4]2+  +  H2O  →  [Co(OH)(NH3)5]2+  + NH3  (3)   (2) Our standard rate laws for associative and dissociative ligand substitution are rate = k[ML6][L’] and rate = k[ML6], respectively. Derive a rate law for the base-hydrolysis ligand substitution above where equation 1 is the rate determining step.

From the molecular orbital perspective, explain what frontier orbitals are involved in the reaction CH3I + Br(-) -> CH3Br + I(-) and why C-I bond will be broken. Comment on the distances observed below and tie them into the explanation.  reaction complex at start distance between C and Br(-): 2.737A, bond length C-I: 2.146A transition state distance between C and Br(-): 2.696A, bond length C-I: 2.577A

6) In this catalytic reaction indicate the number of valence electrons any four metal complexes. The catalytic cycle is for Heck reaction. 12 HBr / Base Ph PP h₂ H-Pd-Br PPh ₂ H-Pd-Br PPh ₂ Base Ph₂P -Komplex B-H elimination reductive elimination PPh₂ -Pd-Br PPh₂ Pd-o intermediate PPh₂ Pº PPh₂ Br insertion oxidative addition PPh3 -Pd²¹-Br PPh ₂ PPh ₂ -Pd¹-Br Ph₂P * complex

Aluminum forms a 1:1 complex with 2-hydroxy-1-naphthaldehyde p -methoxybenzoylhydraxonal, which absorbs UV radiation at 285 nm. Under pseudo-first-order conditions, a plot of the initial rate of the reaction (absorbance units per second) versus the concentration of aluminum (in M) yields a straight linedescribed by the equation rate =1.92 c Al- 0.250 Find the concentration of aluminum in a solution that exhibits a rate of 0.53 absorbance units per second under the same experimental conditions.

What are the relevant transition states for this reaction?

During nitration of chlorobenzene, the sigma complex formed from meta attack will have additional stability relative to the sigma complex formed from either ortho attack or para attack. O True O False

Predict the major products of the follow ing. (c) (a) (b) CI HO,S HNO3 Cl2, ? AICI3 FeCla H,SO, H3CO (e) (d) Br2, ? Conc. HNO, ? FeBr3

Question: In a hypothetical reaction between two complex molecules, A and B, with multiple functional groups, how can one determine the most probable site of reactivity and the resulting product using molecular orbital theory and quantum chemical calculations?