Question

1. Use the following data: Lewis Base (C6H5)3P=O (C6H5)3P=S (C6H5)3P=Se log KBA in CCl4 log KBA in CHCl3 1.38 0.89 2.26 2.13 3.48 3.65 Answer the following questions: A. What are the trends in basicity for each compound in each solvent? (2 pts) B. Provide a reasonable explanation why (C6H5)3P=Se is the strongest base on both solvents (2 pts) C. We see a more pronounced change in the basicity of (C6H5)3P=O going from CCl4 as a solvent to CHCl3 as a solvent, than from the other two bases listed on this table. Provide a reasonable explanation for this behavior. (2 pts) D. The $\lambda_{max}$ for iodine vapor is around 520 nm. Would you expect this value to change upon formation of the Lewis Acid-Lewis Base adduct with these bases? Also, in which direction should the shift occur? (Red or blue shifted). Provide an explanation for your choice. (4 pts).

          1. Use the following data:
Lewis Base
(C6H5)3P=O
(C6H5)3P=S
(C6H5)3P=Se
log KBA in CCl4
log KBA in CHCl3
1.38
0.89
2.26
2.13
3.48
3.65
Answer the following questions:
A. What are the trends in basicity for each compound in each solvent? (2 pts)
B. Provide a reasonable explanation why (C6H5)3P=Se is the strongest base on both solvents (2
pts)
C. We see a more pronounced change in the basicity of (C6H5)3P=O going from CCl4 as a solvent
to CHCl3 as a solvent, than from the other two bases listed on this table. Provide a reasonable
explanation for this behavior. (2 pts)
D. The $\lambda_{max}$ for iodine vapor is around 520 nm. Would you expect this value to change upon
formation of the Lewis Acid-Lewis Base adduct with these bases? Also, in which direction should
the shift occur? (Red or blue shifted). Provide an explanation for your choice. (4 pts).

1. Use the following data:
Lewis Base
(C6H5)3P=O
(C6H5)3P=S
(C6H5)3P=Se
log KBA in CCl4
log KBA in CHCl3
1.38
0.89
2.26
2.13
3.48
3.65
Answer the following questions:
A. What are the trends in basicity for each compound in each solvent? (2 pts)
B. Provide a reasonable explanation why (C6H5)3P=Se is the strongest base on both solvents (2
pts)
C. We see a more pronounced change in the basicity of (C6H5)3P=O going from CCl4 as a solvent
to CHCl3 as a solvent, than from the other two bases listed on this table. Provide a reasonable
explanation for this behavior. (2 pts)
D. The λmax for iodine vapor is around 520 nm. Would you expect this value to change upon
formation of the Lewis Acid-Lewis Base adduct with these bases? Also, in which direction should
the shift occur? (Red or blue shifted). Provide an explanation for your choice. (4 pts).

Added by Clayton M.

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