POSTLAB QUESTIONS 1. Why does the photochemical reaction go faster when a strong

Question

POSTLAB QUESTIONS 1. Why does the photochemical reaction go faster when a strong sunlamp is used rather than direct sunlight? Would the desired reaction occur if t-butyl alcohol were used instead of isopropyl alcohol in the photochemical dimerization of benzophenone? Explain. 2. 3. Benzopinacol and benzopinacolone have nearly identical melting points. Describe (withoutwith using spectroscopic methods) how you could prove that samples of the two compounds are different. 4. Propose a mechanism for the photoreduction of acetophenone. How many products can be formed? Draw their structures. How could you use IR and NMR to tell whether the crystals formed in the photochemical reaction were benzopinacol or benzophenone? 5. 49

Explanation / Answer

Answer:

1)

for the photochemical reaction the light radiation of perticular energy is required whether it is obtained from any source and we know the these are very fast reaction once can be started

2)

The more reactive isopropanol radical is converted to acetone by transferring its hydroxyl hydrogen to benzophenone, thus forming another diphenylmethanol radical. The alcohol should have free hydrogen to abstract. In t butyl alcohol no hydrogen, so ethanol will be used in place of isopropyl alcohol.

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