1. Which of the following is trigonal planar?
A. boron trifluoride, BF3
B. methyl anion, CH3‑
C. methane, CH4
D. ammonia, NH3
2. Which atomic orbitals overlap to form the C=O bond of 2-propanone?
A. C sp3 + O sp2
B. C sp2 + O p
C. C sp2 + O sp2
D. C sp3 + O sp
Draw these orbitals here:
3. Which of the following resonance structures makes the largest contribution to the structure of [H2CCHO]–? Explain.
A. 1
B. 2
C. 3
D. 4
Explain here:
4. Identify the condensed formula of the following structure:
A. (CH3)2CHCHClCH(CH3)2
B. CH3CH(CH3)CHClCH(CH3)2
C. (CH3)2CHCHClC(CH3)3
D. (CH3)3CCHClCH(CH3)3
5. The most stable resonance contributor of this would be:
A. A
B. B
C. C
D. D
Show all resonance structures and provide explanation for the major contributor:
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6. Does the equilibrium of this reaction lie to the left or right? Explain. |
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A) |
Left |
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B) |
Right |
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C) |
It cannot be determined. |
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D) |
The forward and reverse reactions are equally favored. |
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Provide explanations here:
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7. What should go in the box on the right side of the equation? Show work indicating the direction of equilibrium of the reaction. |
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A) |
A |
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B) |
B |
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C) |
C |
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D) |
D |
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E) |
E |
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Show work here:
8. Rank the following from the weakest to the strongest base.
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A) |
OH– < Cl– < NH2– |
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B) |
Cl– < NH2– < OH– |
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C) |
NH2– < OH– < Cl– |
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D) |
Cl– < OH– < NH2– |
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E) |
NH2– < Cl– < OH– |
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