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# 12 - Using the average bond energies given below calculate...

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Unformatted text preview: 2/17/2012 Using the average bond energies given below calculate the H for the following reaction and predict whether or not is favorable (i.e. the products are more stable than the reactants). What is the best reaction mechanism for this reaction? What would have to be the first step? 276 413 347 391 Do aromatic CBr bonds react in substitution reactions SN1 or SN2? A = yes B = no Is the following reaction thermodynamically favorable? (the average bond energies in kJ/mol are the numbers shown below) When these reactants are mixed together does any reaction occur? A = yes B = no A = yes B = no 276 + 413 = 689 kJ/mol 347 + 391 = 738 kJ/mol H = 689 738 = -49 kJ/mol What is the best reaction mechanism for this reaction? Why does this reaction occur when Pd is added? The HeckMizokori reaction A. The Pd stabilizes the products of the reaction making this a favorable process. B. The Pd provides an alternate pathway leading to the products. What would have to be the first step? Are vinyl CH bonds acidic? A = yes B = no 1 2/17/2012 Why does this reaction occur when Pd is added? The HeckMizokori reaction How many pennies in an oz (ounce)? \$1770/oz \$1550/oz Au A. 1 B. 12 C. 120 D. 1,200 E. 2,400 Rh (pages G1, after 998, in book) Which metal is the most expensive near neighbors of Pd? \$1402 1770 \$2400 1550 /oz What value do these metals have? \$1770/oz \$1550/oz A. Ni B. Ag C. Au D. Pt E. Ir F. Rh Au Rh What metal is the least expensive near neighbors of Pd? \$13.00/lb \$32.11 \$1402 1770 \$1630 \$1075 \$2400 1550 /oz What other value do these metals have? \$1770/oz \$1550/oz A. Ni B. Ag C. Au D. Pt E. Ir F. Rh Au Rh ritalin ? \$685 2 2/17/2012 How many electrons does Pd have in its valence shell? A. 2 B. 4 C. 8 D. 10 How does this work? E. 16 F. 18 What is the value of n for Pd(:PPh3)nCl2 for the Pd to have 16 electrons in its valence shell? Pd+2 + 2Cl = ClPdCl A. 2 B. 3 C. 4 D. 6 :PPh3 How many valence electrons would Pd have if it had an inert gas configuration? A. 2 B. 4 C. 8 D. 10 E. 16 F. 18 Why is Pd(:PPh3)nCl2 a useful catalyst in chemistry? It is electron deficient. What is the value of n for Pd(:PPh3)n for the Pd to have an inert gas configuration? A. 2 B. 4 C. 8 D. 10 E. 16 F. 18 How many electrons does Rh have in its valence shell? A. 2 B. 4 Ligands R3P: H: Cl: H PR3 R3P Rh H R3 P Cl C. 8 D. 10 E. 16 F. 18 3 ...
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