Which of the following compounds will not give positive iodoform test.
Acetophenone, Benzophenone, `2`-Pentanone, `3`-Pentanone, Acetaldehyde,
`CH_(3)COCH_(3), (CH_(3))_(2)CHOH, (CH_(3)CH_(2))_(2)CH-OH, CH_(3)COOH, CH_(3)CONH_(2), CH_(3)COOCH_(3), CH_(3)COCl`

Explanation

To determine which compounds will not give a positive iodoform test, we need to identify those that do not contain the CH3C(=O) group or its derivatives. The iodoform test is positive for compounds that have a methyl ketone (RCOCH3) or a primary alcohol that can be oxidized to a methyl ketone.

Let's analyze each compound step by step:

1. **Acetophenone (C6H5COCH3)**:
- Structure: Contains CH3C(=O) group.
- Conclusion: **Will give a positive iodoform test.**

2. **Benzophenone (C6H5COC6H5)**:
- Structure: Does not contain CH3C(=O) group.
- Conclusion: **Will NOT give a positive iodoform test.**

3. **2-Pentanone (CH3COCH2CH2CH3)**:
- Structure: Contains CH3C(=O) group.
- Conclusion: **Will give a positive iodoform test.**

4. **3-Pentanone (CH3CH2COCH2CH3)**:
- Structure: Does not contain CH3C(=O) group.
- Conclusion: **Will NOT give a positive iodoform test.**

5. **Acetaldehyde (CH3CHO)**:
- Structure: Contains CH3C(=O) group.
- Conclusion: **Will give a positive iodoform test.**

6. **Acetone (CH3COCH3)**:
- Structure: Contains CH3C(=O) group.
- Conclusion: **Will give a positive iodoform test.**

7. **2-Propanol ((CH3)2CHOH)**:
- Structure: Can be oxidized to acetone (CH3COCH3).
- Conclusion: **Will give a positive iodoform test.**

8. **2-Butanol ((CH3CH2)2CHOH)**:
- Structure: Does not contain CH3C(=O) group.
- Conclusion: **Will NOT give a positive iodoform test.**

9. **Acetic Acid (CH3COOH)**:
- Structure: Contains CH3C(=O) group.
- Conclusion: **Will give a positive iodoform test.**

10. **Acetamide (CH3CONH2)**:
- Structure: Contains CH3C(=O) group.
- Conclusion: **Will give a positive iodoform test.**

11. **Methyl Acetate (CH3COOCH3)**:
- Structure: Contains CH3C(=O) group.
- Conclusion: **Will give a positive iodoform test.**

12. **Acetyl Chloride (CH3COCl)**:
- Structure: Contains CH3C(=O) group.
- Conclusion: **Will give a positive iodoform test.**

### Summary of Compounds That Will NOT Give Positive Iodoform Test:
- **Benzophenone**
- **3-Pentanone**
- **2-Butanol**

### Final Answer:
The compounds that will not give a positive iodoform test are **Benzophenone, 3-Pentanone, and 2-Butanol**.

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