Alcohol which gives blue colour in Victor - Meyer test is

Options

A. Only `CH_(3) - CH_(2) - OH`
B. Only `CH_(3) - CH_(2) - CH_(2) OH`
C. All the alcohols containing `- CH_(2) OH` group
D. All the alcohols containing `gt CHOH` group

Answer

To determine which alcohol gives a blue color in the Victor-Meyer test, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Victor-Meyer Test**:
- The Victor-Meyer test is used to classify alcohols based on their structure (primary, secondary, or tertiary) by observing the color change during the test.

2. **Reagents Used in the Test**:
- The test involves treating the alcohol with red phosphorus and iodine to form an alkyl iodide.
- This alkyl iodide is then treated with silver nitrate to form a nitroalkane.
- Finally, the nitroalkane is reacted with nitrous acid, and the resulting solution is made alkaline.

3. **Color Indicators**:
- If a blood-red color is formed, it indicates the presence of a primary alcohol.
- A blue color indicates the presence of a secondary alcohol.
- If no color is formed (colorless), it indicates a tertiary alcohol.

4. **Identify the Correct Alcohol**:
- Since the question asks for the alcohol that gives a blue color, we are specifically looking for a secondary alcohol.
- In the options provided, we need to identify which one is a secondary alcohol.

5. **Conclusion**:
- The correct answer is the secondary alcohol, which is the only type that produces a blue color in the Victor-Meyer test.

### Final Answer:
The alcohol which gives a blue color in the Victor-Meyer test is a **secondary alcohol**.

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