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41- Which topics should be discussed about the g-diketone A. lower pKa B. higher pKa C....

Image result for VII. (24 points) (i) Explain and show why the enol form ( ) of -diketones exist in a higher percentage than for ketones.

41- Which topics should be discussed about the g-diketone A. lower pKa B. higher pKa C. same pKa D. carbonyl’s farther apart E. longer H-bond ring F. shorter H-bond ring G. more hydrophobic H. less hydrophobic I. more lonely carbonyls?

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Answer #1

VII. enol form of \beta -diketone is more stable due to intramolecular hydrogen bonding interaction as shown below.

more stable due to hydrogen bonding

38. the answer is option D (the structure is shown above)

ii) enol form will be stable in cyclohexane. because the intramolecular hydrogen bonding will exist only in a non-polar non-protic solvent like cyclohexane. in water more intermolecular hydrogen will be formed therefore in water only diketo form is more stable

39. the answer is option B. hexane

40. the answer is structure c.

hydrogen bonding diketo form is stabilized by hydrogen bonding as shown abovel

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