In the addition of sodium bisulfite to carbonyl system, which of the following is nucleophile?

Explanation

In the addition of sodium bisulfite (NaHSO3) to a carbonyl system, the nucleophile is the sulfite ion (SO32-). Sodium bisulfite reacts with carbonyl compounds, such as aldehydes and ketones, in a nucleophilic addition reaction. The sulfur atom in the sulfite ion (SO32-) bears a partial negative charge, making it a nucleophile. The nucleophilic sulfur attacks the electrophilic carbon of the carbonyl group, forming an addition product known as a bisulfite adduct. The reaction can be represented as follows: R-C=O + NaHSO3 → R-C(HSO3)O-Na+ (Bisulfite adduct) In this reaction, the sulfite ion (SO32-) acts as the nucleophile and adds to the carbonyl carbon, resulting in the formation of the bisulfite adduct. Therefore, option b is correct.