The compound that will not give iodoform on treatment with alkali and iodine is :

Options

A. a.Acetone
B. b.Ethanol
C. c.Diethyl ketone
D. d.Isopropyl alcohol

Explanation

To determine which compound will not give iodoform on treatment with alkali and iodine, we need to understand the iodoform reaction and the structural requirements for a compound to undergo this reaction.

### Step-by-Step Solution:

1. **Understand the Iodoform Reaction**:
The iodoform reaction occurs when a compound contains a methyl ketone group (C=O with a CH3 group adjacent to it) or a secondary alcohol with a methyl group adjacent to the hydroxyl group. The general structure for these compounds is:
- For methyl ketones: R-C(=O)-CH3
- For secondary alcohols: R-CHOH-CH3

2. **Analyze the Given Options**:
We need to evaluate each option to see if it contains the necessary functional groups to give a positive iodoform test.

- **Option A: Ketone (e.g., CH3C(=O)CH3)**:
This is a methyl ketone and will give a positive iodoform test because it has the structure C=O with CH3 adjacent to it.

- **Option B: Ethanol (CH3CH2OH)**:
Ethanol is a primary alcohol and does not have the necessary structure (C=O with CH3 adjacent) to give a positive iodoform test. However, it can be oxidized to acetaldehyde, which can give a positive test.

- **Option C: Diethyl ketone (CH3C(=O)CH2CH3)**:
This is a ketone but does not have the methyl group adjacent to the carbonyl carbon. Therefore, it will not give a positive iodoform test.

- **Option D: Isopropyl alcohol (CH3CHOHCH3)**:
This is a secondary alcohol and will give a positive iodoform test because it has the structure CH3-CHOH-CH3.

3. **Conclusion**:
Among the options, **Option C (Diethyl ketone)** is the compound that will not give iodoform on treatment with alkali and iodine.

### Final Answer:
**Option C: Diethyl ketone** will not give iodoform on treatment with alkali and iodine.

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