=========================preview======================
(chem332)[2006](s)midterm~PPSpider^_10053.pdf
Back to CHEM332 Login to download
======================================================
Name: _______________________ Student ID: ____________________
Chem 332 Organometallic Chemistry Midterm Examination
Monday, March 27, 2006. Time allowed, 80 minutes. Total 80 points (plus 5 bonus points)
Note: I prepared the answers in rush. It may contain mistakes. Please let me know if you find obvious mistakes.
Section 1. Multiple Choices (2 points each, 28 points total). For each question, select the most appropriate answer by either writing it out or circling your choice.
1.1. Which of the following species could form metal complexes with a transition metal?
a) H3SiCH2CH2SiH3 b) CH3I c) CO2 d) N2
e) two of them f) three of them g) all of them h) none of them
g)
1.2. Which of the following species can function as a donor?
a) CH2=CH2 b) I- c) NMe2- d) HCCH
e) two of them f) three of them g) all of them h) none of them
f)
1.3. Which of the following complexes follows/follow the 18e rule?
d) two of them e) all of them f) none of them
d)
1.4. Which of the following complexes would you expect to have the lowest C-O stretching frequency?
a) Ni(CO)4 b) trans-Cr(CO)4(PMe3)2
c) [Ag(CO)2]+ d) Pt(CO)4
b)
1.5. Which of the following complexes follows/follow the 18e rule? [Be careful!]
c) both of them d) none of them
a)
1.6. Which of the following complexes follows/follow the 18e rule?
c) both of them d) none of them
c)
1.7. Which of the following complexes follows/follow the 18e rule?
c) both of them d) none of them
b)
1.8. Which of the following complexes is least likely to be isolated?
b)
1.9. Which of the following complexes would you expect to have the strongest Rh-C bond?
a) Cp*(PMe3)HRh-CH3 b) Cp*(PMe3)HRh-CH2CH3
c) Cp*(PMe3)HRh-CH2Ph d) Cp*(PMe3)HRh-CCMe
d)
1.10. Which of the following hydride complexes would you expect to be most acidic?
a) CpCr(CO)3H b) CpW(CO)3H c) Cp*Mo(CO)3H
d) CpW(CO)2(PMe3)H e) can not be predicted
a)
1.11. Which of the following ligands would you expect to have the largest cone angle?
a) AsCy3 (cy = cyclohexyl) b) AsCl3 c) AsMe3 d) AsPh3
a)
1.12. Which of the following dissociative substitution reactions would you expect to occur least readily?
a) RuH2(CO)3(CH3CN) + PMe3 ---------> RuH2(CO)3(PMe3) + CH3CN
b) OsH2(CO)4 + PMe3 ---------> OsH2(CO)3(PMe3) + CO
c) Ni(CO)4 + PMe3 ---------> Ni(CO)3(PMe3) + CO
d) [FeH(CO)5]+ + PMe3 -------------> [FeH(CO)4(PMe3)]+ + CO
b)
1.13. Consider the associative substitution reactions LnM-L' + L''--------> LnML'' + L'.
Which of the following statements is/are incorrect?
a) The reaction rate is independent of L''.
b) The activation energy must be negative.
c) The activation entropy must be negative.
d) LnM-L' cannot be an 18-electron complex.
e) two of them f) three of them g) all of them h) none of them