Assertion: Isobutanal does not give iodoform test.
Reason: It does not have `alpha`-hydrogen.

Options

A. If both assertion and reason are true and reason is the explaination of assertion.
B. If both assertion and reason are true but reason is not the correct explaination of assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false.

Explanation

To solve the question, we need to analyze both the assertion and the reason provided.

### Step 1: Understand the Assertion
The assertion states that "Isobutanal does not give the iodoform test."

**Explanation**: The iodoform test is a qualitative test used to identify the presence of a methyl ketone or an alcohol that can be oxidized to a methyl ketone. For a compound to give a positive iodoform test, it must have a methyl group (–CH3) adjacent to the carbonyl group (C=O) or be able to form such a structure upon oxidation.

### Step 2: Analyze Isobutanal Structure
Isobutanal has the following structure:
- **Chemical Formula**: CH₃-CH(CH₃)-C(=O)H
- **Structure**:
```
CH3
|
CH3-CH-C(=O)H
```

**Observation**: In isobutanal, the carbonyl group (C=O) is not adjacent to a methyl group (–CH3) on both sides. Therefore, it cannot form the necessary structure to give a positive iodoform test.

### Step 3: Understand the Reason
The reason states that "It does not have alpha-hydrogen."

**Explanation**: Alpha-hydrogens are the hydrogen atoms attached to the carbon atom adjacent to the carbonyl group. In the case of isobutanal, the carbon adjacent to the carbonyl (C=O) does have hydrogen atoms attached to it.

### Step 4: Conclusion
- The assertion is **true**: Isobutanal does not give the iodoform test.
- The reason is **false**: Isobutanal does have alpha-hydrogens.

### Final Answer
The correct answer is **C**: The assertion is true, and the reason is false.

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