Butan-2-ol is a `:`

Options

A. primary alcohol
B. secondary alcohol
C. tertiary alcohol
D. dihydric alcohol

Answer

To determine the classification of butan-2-ol as a primary, secondary, or tertiary alcohol, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Structure of Butan-2-ol**:
Butan-2-ol is an alcohol with the molecular formula C4H10O. The "2" in the name indicates that the hydroxyl (–OH) group is attached to the second carbon of a four-carbon chain (butane).

2. **Draw the Structure**:
The structure of butan-2-ol can be represented as follows:
```
CH3
|
CH3-CH-OH
|
CH2
```
Here, the hydroxyl group (–OH) is attached to the second carbon atom in the butane chain.

3. **Determine the Carbon Connectivity**:
To classify the alcohol, we need to look at the carbon atom that is bonded to the hydroxyl group. In butan-2-ol, the carbon atom with the –OH group is connected to two other carbon atoms (the first and the third carbon).

4. **Classify the Alcohol**:
- **Primary Alcohol**: The carbon with the –OH group is attached to only one other carbon.
- **Secondary Alcohol**: The carbon with the –OH group is attached to two other carbons.
- **Tertiary Alcohol**: The carbon with the –OH group is attached to three other carbons.

Since the carbon with the –OH group in butan-2-ol is attached to two other carbon atoms, it is classified as a **secondary alcohol**.

5. **Conclusion**:
Therefore, butan-2-ol is a **secondary alcohol**.