In the addition of sodium bisulfite to carbonyl system, which of the following is a nucleophile?
Correct answer: B. Sulfite ion
- A. Sulphide ion
- B. Sulfite ion
- C. Hydride ion
- D. Sodium ion
Explanation
The addition of sodium bisulfite to a carbonyl group takes place as follows:Sodium bisulfite ionizes to form sulfite ions.The sulfite ion acts as a nucleophile, since the sulfur atom is more nucleophilic than oxygen, a C-S bond is formed.Proton is attached to the negatively charged sulfur atom to form a bisulfite addition product.
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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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