Aldehydes and ketone will not form crystalline drivatives with

Options

A. sidum bisulphite
B. phenyl hydrazine
C. semicarbazide hydrochloride
D. dihydrogen sodium phosphate

Explanation

To determine which reagent does not form crystalline derivatives with aldehydes and ketones, we will analyze each reagent provided in the question.

### Step-by-step Solution:

1. **Understanding Aldehydes and Ketones**:
- Aldehydes and ketones contain a carbonyl group (C=O) which is polar and can react with nucleophiles.

2. **Analyzing the Reagents**:
- **Sodium Bisulfite (NaHSO3)**:
- Reacts with aldehydes and ketones to form bisulfite adducts, which are crystalline in nature.
- Reaction: RCHO + NaHSO3 → RCH(OH)SO3Na (crystalline derivative).

- **Phenylhydrazine (C6H5NHNH2)**:
- Forms phenylhydrazones with aldehydes and ketones, which are also crystalline.
- Reaction: RCHO + C6H5NHNH2 → RCH=N-NHC6H5 + H2O (phenylhydrazone).

- **Semicarbazide (NH2NH-C(O)NH2)**:
- Forms semicarbazones with aldehydes and ketones, which are crystalline.
- Reaction: RCHO + NH2NH-C(O)NH2 → RCH=N-NH-C(O)NH2 + H2O (semicarbazone).

- **Hydrochloride**:
- This is not a specific reagent in the context of forming derivatives with carbonyl compounds. It may refer to hydrochloric acid, which does not form crystalline derivatives with aldehydes and ketones.

- **Dihydrogen Sodium Phosphate (NaH2PO4)**:
- This compound does not react with aldehydes or ketones to form derivatives. Phosphorus does not have a lone pair of electrons to act as a nucleophile.

3. **Conclusion**:
- Among the options, dihydrogen sodium phosphate (NaH2PO4) does not form crystalline derivatives with aldehydes and ketones because it lacks a reactive nucleophile. Therefore, the correct answer is **option 4**.

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

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