In the addition of sodium bisulfite to carbonyl system, which of the following is nucleophile?
Correct answer: B. Sulfite ion
- A. Sulphide ion
- B. Sulfite ion
- C. Hydride ion
- D. Sodium ion
Explanation
Option A is wrong because sulphide doesn't act as a nucleophile.Option: B Sodium bisulphite ionizes to form sulphite ions. The sulphite ions act as a nucleophile, since the sulphur atom is more nucleophilic than oxygen, a C-S bond is formed. Proton is attached to the negatively charged oxygen atom to form a bisulphite addition product. Option C is wrong because there is no hydride ion in the reaction. So, hydride ions will not act as nucleophiles. Option D is wrong because sodium ions will not act as nucleophiles.
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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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