A compound does not react with 2,4-dinitrophenyl hydrazine, compound is :

Options

A. `CH_(3)CONH_(2)`
B. `NH_(2)CONH_(2)`
C. `CH_(3)COOC_(2)H_(5)`
D. `"CCl"_(3)CH(OH)_(2)`

Answer

To determine which compound does not react with 2,4-dinitrophenylhydrazine (DNP), we need to understand the nature of the DNP test. The DNP test is primarily used to detect the presence of carbonyl groups, specifically aldehydes and ketones. Compounds that do not contain these functional groups will not react with DNP.

### Step-by-Step Solution:

1. **Understand the DNP Test**:
- The DNP test is used to identify aldehydes and ketones. The presence of a carbonyl group (C=O) is essential for a reaction to occur with DNP.

2. **Analyze the Given Options**:
- **Option A: CH3CONH2 (Acetamide)**
- This compound contains an amide functional group (C=O bonded to NH2). It does not have a free carbonyl group that can react with DNP, as the carbonyl is part of the amide.
- **Option B: NH2CONH2 (Urea)**
- Urea is another amide. It also does not have a carbonyl group that can react with DNP, as it is involved in the amide bond.
- **Option C: CH3COO (Acetic Acid)**
- This is an ester. Esters do not have a free carbonyl group that can react with DNP; the carbonyl is part of the ester functional group.
- **Option D: CCl3CHO (Trichloroacetaldehyde)**
- This compound has an aldehyde functional group (CHO), which will react with DNP.

3. **Conclusion**:
- The compounds that do not react with 2,4-dinitrophenylhydrazine are **Option A (Acetamide)**, **Option B (Urea)**, and **Option C (Acetic Acid)**.
- Therefore, the correct answer is A, B, and C.