Correct stament for nucleophlic addition of sodium bisulphate on carbonyl compounds is :

Options

A. This addition is highly sensitive to crowding steric crowding increase, then addition decreases, so aldehyde more reactive than ketone in this reaction
B. This reaction used for separation of aldehyde and ketone from a mixture containing some other compounds becouse addition product is a crystaline salt
C. It is reversible reaction, so bisulphite addition product regenerate corresponding carbonyl compound on treatment with acid or base
D. All of these

Answer

To solve the question regarding the correct statement for the nucleophilic addition of sodium bisulfate on carbonyl compounds, we need to understand the nature of the reaction and the role of sodium bisulfate.

### Step-by-Step Solution:

1. **Understanding Nucleophilic Addition**:
- Nucleophilic addition is a reaction where a nucleophile attacks an electrophilic carbon atom in a carbonyl compound (like aldehydes and ketones).

2. **Identifying Sodium Bisulfate**:
- Sodium bisulfate (NaHSO₄) can act as a nucleophile due to the bisulfate ion (HSO₄⁻), which can donate a pair of electrons.

3. **Reaction with Carbonyl Compounds**:
- When sodium bisulfate reacts with a carbonyl compound, the bisulfate ion attacks the carbonyl carbon, leading to the formation of a tetrahedral intermediate.

4. **Formation of Addition Product**:
- The tetrahedral intermediate can then undergo protonation or further reaction to yield a stable addition product. This product often has a hydroxyl group and a sulfonate group.

5. **Correct Statement**:
- The correct statement for the nucleophilic addition of sodium bisulfate on carbonyl compounds is that it results in the formation of a bisulfite addition product, which can be isolated as a white crystalline solid.

### Final Answer:
The correct statement for the nucleophilic addition of sodium bisulfate on carbonyl compounds is that it leads to the formation of a bisulfite addition product.