Which of the structural isomeric ketones having molecular formula `(C_(5)H_(10)O)` give iodoform test ?

Explanation

To determine which structural isomeric ketones with the molecular formula \(C_5H_{10}O\) give the iodoform test, we can follow these steps:

### Step 1: Identify the possible structural isomers of ketones with the formula \(C_5H_{10}O\).

The molecular formula \(C_5H_{10}O\) indicates that we are dealing with ketones. The general structure of a ketone is \(R_1C(=O)R_2\), where \(R_1\) and \(R_2\) are alkyl groups.

Possible structural isomers include:
1. Pentan-2-one: \(CH_3COCH_2CH_2CH_3\)
2. Pentan-3-one: \(CH_3CH_2COCH_2CH_3\)
3. 3-Methylbutan-2-one: \(CH_3C(CH_3)COCH_2CH_3\)
4. 2-Pentanone: \(CH_3CH_2C(=O)CH_2CH_3\)

### Step 2: Determine which of these isomers can give the iodoform test.

The iodoform test is specific to methyl ketones, which are ketones that have at least one methyl group (\(-CH_3\)) adjacent to the carbonyl group (\(C=O\)).

- **Pentan-2-one**: Has a methyl group adjacent to the carbonyl group. It can give the iodoform test.
- **Pentan-3-one**: Does not have a methyl group adjacent to the carbonyl group. It cannot give the iodoform test.
- **3-Methylbutan-2-one**: Has a methyl group adjacent to the carbonyl group. It can give the iodoform test.
- **2-Pentanone**: Has a methyl group adjacent to the carbonyl group. It can give the iodoform test.

### Step 3: List the ketones that give the iodoform test.

From the analysis:
- Pentan-2-one
- 3-Methylbutan-2-one
- 2-Pentanone

### Final Answer:

The structural isomeric ketones with the molecular formula \(C_5H_{10}O\) that give the iodoform test are:
1. Pentan-2-one
2. 3-Methylbutan-2-one
3. 2-Pentanone