classes_Spring08_172ID39_ProblemSet4 - 51 Cr, are given in...

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1 Chemistry 172/273 Problem Set #4 Due on Friday, June 6, in class Problems 8-10 will not be graded; they cover the last two lectures. Spring 2008 Note : Do not use a pencil. Use black ink only. Try to write as neatly as possible. If I don’t understand your handwriting, you will not get any points. 1 . The high-spin d 4 complex [Cr(OH 2 ) 6 ] 2+ is labile, but the low-spin d 4 complex [Cr(CN) 6 ] 4- is inert. Explain. 2 . Predict whether these complexes would be labile or inert and explain your choices. For each complex the magnetic moment is given in Bohr magnetons: Ammonium oxopentachlorochromate(V) 1.82 Potassium hexaiodomanganate(IV) 3.82 Potassium hexacyanoferrate(III) 2.40 Hexaammineiron(II) chloride 5.45 3 . Account for the observation that two separate water exchange rates are found for [Cu(OH 2 ) 6 ] 2+ in solution. 4 . Propose synthetic routes for the following: Pt Cl H 3 N Cl Cl Pt Br H 3 N py Cl Pt Cl Cl Cl Cl Pt Cl O 2 N Cl py 2- a) b) 5 . The rate constants for the exchange reaction CrX 2+ + *Cr 2+ *CrX 2+ + Cr 2+ , where *Cr is radioactive
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Unformatted text preview: 51 Cr, are given in the table for reactions at 0 °C and 1 M HClO 4 . Explain the differences in the rate constants in terms of the probable mechanism of the reaction. X k (M-1 s-1 ) F Cl Br NCS N 3 1.2 x 10-3 11 60 1.2 x 10-4 (at 24 °C) > 1.2 6 . Is the reaction [Co(NH 3 ) 6 ] 3+ + [Cr(OH 2 ) 6 ] 2+ likely to proceed by an inner-sphere or outer-sphere mechanism? Explain your answer. 2 7 . Which of the following trans complexes would you expect to react most rapidly with CO? Least rapidly? Briefly explain your choices. 8 . Predict the products of the following reactions: 9 . The complex shown below loses CO on heating. Would you expect this CO to be 12 CO, 13 CO, or a mixture of both? Why? 10 . Identify each of the reactions in the transformation below as oxidative addition, reductive elimination, ligand dissociation, etc. Some of the reactions are not the elementary steps. For those processes show each step....
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This note was uploaded on 10/12/2009 for the course CHEM C172 taught by Professor Zink,j during the Spring '08 term at UCLA.

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classes_Spring08_172ID39_ProblemSet4 - 51 Cr, are given in...

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