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Unformatted text preview: concise reasons for your choices . (a) (i) Lowest pKa B (ii) Highest pKa C Aldehydes have the most pK a-lowering effect than ketones that in turn are more effective than esters. On your own, draw the appropriate resonance structures to support this assertion. (b) Circle only the most acidic H in each of the following compounds and select the compound that will give (i) the highest amount of the enol isomer and (ii) one that will give the lowest amount of the enol. Give reasons. O H H H H O O H H H H H H O O H H H O O H H H A B C B will give the highest enol concentration because it is the strongest acid (keto-aldehyde) while A will give the lowest because it is the weakest acid (keto-ester). Note that C is a diketone. So it will be in-between....
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- Spring '09
- pH, major organic product