In base catalyzed reaction of carbonyl compound the catalyst___________________?
Correct answer: A. increases the nucleophilic character of reagent
- A. increases the nucleophilic character of reagent
- B. increases electrophilic character of carbonyl compound
- C. acidic character of reagent
- D. both a and b
Explanation
A base removes a proton from a nucleophilic reagent such as water, alcohol or a carbon compound, increasing the concentration and nucleophilic character of the attacking species. It does not generally increase the electrophilic character of the carbonyl carbon, which is more typical of acid catalysis. Students may choose d by assuming every catalyst activates both reactants in the same way.
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About Nucleophilic Addition Reactions
Nucleophilic addition occurs at the polar carbonyl group of aldehydes and ketones, where a nucleophile attacks the electron-deficient carbon atom. Reactions with hydrogen cyanide, sodium bisulfite, alcohols and Grignard reagents are explained through tetrahedral intermediates, acid or base catalysis, and the different reactivity of aldehydes and ketones.
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