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*4. The UV spectrum of acetone shows absorption maxima at 166, 189, and 279 nm. What type of transition is responsible for each of these bands? Hint: Consult Table 7.3.

*4. The UV spectrum of acetone shows absorption maxima at 166, 189, and 279 nm. What type of transition is responsible for each of these bands? Hint: Consult Table 7.3.

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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CH3 ċ-OCH3 CH; H *4. The UV spectrum of acetone shows absorption maxima at 166, 189, and 279 nm. What type of transition is responsible for each of these bands? Hint: Consult Table 7.3. *5. Chloromethane has an absorption maximum at 172 nm, bromomethane shows an absorption at 204 nm, and iodomethane shows a band at 258 nm. What type of transition is responsible for cach band? How can the trend of absorptions be explained? *6. What types of electronic transitions are possible for each of the following compounds? (a) Cyclopentene (b) Acetaldehyde (c) Dimethyl ether (d) Methyl vinyl ether (e) Triethylamine (f) Cyclohexane 7. Predict and explain whether UV/visible spectroscopy can be used to distinguish between the following pairs of compounds. Where possible, support your answers with calculations. CH3 CH3 CH3 CH3 CH3 CH3 CH3 CH3 CH,-CH3 CH3 CH3 ОН CH2 OH CH3-CH, CH3 CH3 0–CH2-CH3 CH3-CH 0-CH3 End | Recommended Word Count: 0
Transcribed Image Text:CH3 ċ-OCH3 CH; H *4. The UV spectrum of acetone shows absorption maxima at 166, 189, and 279 nm. What type of transition is responsible for each of these bands? Hint: Consult Table 7.3. *5. Chloromethane has an absorption maximum at 172 nm, bromomethane shows an absorption at 204 nm, and iodomethane shows a band at 258 nm. What type of transition is responsible for cach band? How can the trend of absorptions be explained? *6. What types of electronic transitions are possible for each of the following compounds? (a) Cyclopentene (b) Acetaldehyde (c) Dimethyl ether (d) Methyl vinyl ether (e) Triethylamine (f) Cyclohexane 7. Predict and explain whether UV/visible spectroscopy can be used to distinguish between the following pairs of compounds. Where possible, support your answers with calculations. CH3 CH3 CH3 CH3 CH3 CH3 CH3 CH3 CH,-CH3 CH3 CH3 ОН CH2 OH CH3-CH, CH3 CH3 0–CH2-CH3 CH3-CH 0-CH3 End | Recommended Word Count: 0
PROBLEMS *1. The ultraviolet spectrum of benzonitrile shows a primary absorption band at 224 nm and a secondary band at 271 nm. (a) If a solution of benzonitrile in water, with a concentration of 1 x 104 molar, is examined at a wavelength of 224 nm, the absorbance is determined to be 1.30. The cell length is 1 cm. What is the molar absorptivity of this absorption band? (b) If the same solution is examincd at 271 nm, what will be the absorbance reading (ɛ = 1000)? What will be the intensity ratio, Io/I? *2. Draw structural formulas that are consistent with the following observations. (a) An acid, C7H4O2C12, shows a UV maximum at 242 nm. (b) A ketone, C3H140, shows a UV maximum at 248 nm. (c) An aldehyde, C3H120, absorbs in the UV with Amax = 244 nm. *3. Predict the UV maximum for each of the following substances. (а) (b) CH,=CH--C-CH3 CH3 CH,– CH3 CH3 CH3 (c) (d) CH3 CH3 (e) CH3 (f) CH3 CH3 CH;-C-O (h) OCH3 C-CH3 CH30. CH3 (i) (j) CH3 :-OCH3 CH-C-N H
Transcribed Image Text:PROBLEMS *1. The ultraviolet spectrum of benzonitrile shows a primary absorption band at 224 nm and a secondary band at 271 nm. (a) If a solution of benzonitrile in water, with a concentration of 1 x 104 molar, is examined at a wavelength of 224 nm, the absorbance is determined to be 1.30. The cell length is 1 cm. What is the molar absorptivity of this absorption band? (b) If the same solution is examincd at 271 nm, what will be the absorbance reading (ɛ = 1000)? What will be the intensity ratio, Io/I? *2. Draw structural formulas that are consistent with the following observations. (a) An acid, C7H4O2C12, shows a UV maximum at 242 nm. (b) A ketone, C3H140, shows a UV maximum at 248 nm. (c) An aldehyde, C3H120, absorbs in the UV with Amax = 244 nm. *3. Predict the UV maximum for each of the following substances. (а) (b) CH,=CH--C-CH3 CH3 CH,– CH3 CH3 CH3 (c) (d) CH3 CH3 (e) CH3 (f) CH3 CH3 CH;-C-O (h) OCH3 C-CH3 CH30. CH3 (i) (j) CH3 :-OCH3 CH-C-N H
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