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 need to analyze the characteristics of different types of alcohols (primary, secondary, and tertiary) and how they react in this specific test.

### Step-by-Step Solution:

1. **Understanding the Victor-Meyer Test**:
- The Victor-Meyer test is a qualitative test used to differentiate between primary, secondary, and tertiary alcohols based on their reaction with iodine (I2) and red phosphorus (P).
- The test involves converting the alcohol into an alkyl iodide, which is then treated with silver nitrate (AgNO3) to form a nitroalkane.

2. **Identifying Alcohol Types**:
- **Primary Alcohols**: Have one alkyl group attached to the carbon bearing the hydroxyl (OH) group. Example: CH3CH2OH (ethanol).
- **Secondary Alcohols**: Have two alkyl groups attached to the carbon bearing the hydroxyl group. Example: CH3CHOHCH3 (isopropanol).
- **Tertiary Alcohols**: Have three alkyl groups attached to the carbon bearing the hydroxyl group. Example: (CH3)3COH (tert-butanol).

3. **Reactions in the Victor-Meyer Test**:
- In the test, primary alcohols typically do not give a color change, while tertiary alcohols also do not produce a blue color.
- Secondary alcohols are known to give a blue color in the Victor-Meyer test.

4. **Conclusion**:
- Based on the reactions and the type of alcohols, the alcohol that gives a blue color in the Victor-Meyer test is **secondary alcohols**.

5. **Final Answer**:
- The correct answer is **secondary alcohols**.