During base catalyzed reactions, which property of "nucleophile" increases?
Correct answer: B. Nucleophilicity
- A. Basicity
- B. Nucleophilicity
- C. Electrophilicity
- D. Both Options B and C are correct
Explanation
A base-catalyzed nucleophilic addition will take place in the presence of a strong base, which is usually the conjugate base of a reagent used for nucleophilic addition. The base which is also a nucleophile, attacks the carbon atom of the carbon-oxygen double bond, and pi electrons of the C=O bond to the oxygen atom, which can easily accommodate the negative charge, because of its high electronegativity. The reaction is completed by the abstraction of a proton, from the reagent by negative oxygen, to regenerate the base. Thus, the base increases the nucleophilic character of the reagent to be added.Hence, B is the correct answer.
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About Aldehydes and Ketones
Aldehydes and ketones contain the polar carbonyl group, but aldehydes are generally more readily oxidised and more reactive than ketones. Coverage includes preparation by oxidation or reduction routes, nucleophilic addition of reagents such as hydrogen cyanide and bisulfite, and tests that distinguish aldehydes from ketones.
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