Aldehydes and ketones will not form crystalline derivatives with

Options

A. sodium bisulphite
B. phenylhydrazine
C. semicarbazide hydrochloride
D. dihydrogen sodium phosphate.

Explanation

To determine which compounds aldehydes and ketones will not form crystalline derivatives with, we need to analyze the reactivity of these compounds with various reagents. Aldehydes and ketones contain a carbonyl group (C=O), which is electron-deficient and can react with nucleophiles to form derivatives.

### Step-by-Step Solution:

1. **Understanding Aldehydes and Ketones**:
- Aldehydes have the general formula R-CHO, while ketones have the formula R-CO-R'. Both contain a carbonyl group (C=O) that is susceptible to nucleophilic attack.

2. **Reagents that Form Crystalline Derivatives**:
- Aldehydes and ketones can react with various nucleophiles to form crystalline derivatives. Common reagents include:
- Sodium bisulfite (NaHSO3)
- Phenylhydrazine
- Semicarbazide
- These reagents have nucleophilic sites that can attack the electron-deficient carbonyl carbon, leading to the formation of stable, crystalline products.

3. **Analyzing the Given Options**:
- We need to identify a reagent that does not have a nucleophile capable of attacking the carbonyl carbon.
- The options provided include various compounds, and we need to find one that lacks the necessary nucleophilic characteristics.

4. **Identifying the Correct Answer**:
- Dihydrogen sodium phosphate (NaH2PO4) is the option that does not form a crystalline derivative with aldehydes or ketones.
- The phosphorus atom in NaH2PO4 does not have a lone pair of electrons to act as a nucleophile, which means it cannot attack the carbonyl carbon of aldehydes or ketones.

5. **Conclusion**:
- Therefore, the correct answer is that aldehydes and ketones will not form crystalline derivatives with **Dihydrogen Sodium Phosphate (NaH2PO4)**.

### Final Answer:
Aldehydes and ketones will not form crystalline derivatives with **Dihydrogen Sodium Phosphate (NaH2PO4)**.

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