The correct name of 2-chlorobutan-3-ol is

Options

A. 3-Chloro-2-hydroxy butane
B. 3-Chloro-2-butanol
C. 3-Hydroxy-2-cholro butane
D. 2-Chloro-3-hydroxy butane

Answer

To determine the correct IUPAC name for the compound 2-chlorobutan-3-ol, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Base Chain**:
- The name "butan" indicates that the longest carbon chain contains 4 carbon atoms.

2. **Draw the Structure**:
- Start by sketching a straight chain of 4 carbon atoms (C1, C2, C3, C4).
- The structure looks like this:
```
C1 - C2 - C3 - C4
```

3. **Add the Functional Groups**:
- The "2-chloro" indicates that there is a chlorine (Cl) atom attached to the second carbon (C2).
- The "3-ol" indicates that there is a hydroxyl group (OH) attached to the third carbon (C3).
- The structure now looks like this:
```
CH3 - CH(Cl) - CH(OH) - CH2
```

4. **Number the Carbon Chain**:
- To assign the correct numbers to the carbon atoms, we need to number the chain from the end closest to the functional group (OH) to give it the lowest possible number.
- Numbering from the left gives us:
- C1: CH3
- C2: CH(Cl)
- C3: CH(OH)
- C4: CH2

5. **Write the IUPAC Name**:
- According to IUPAC nomenclature, we list the substituents in alphabetical order, followed by the base name of the compound.
- The substituents are "chloro" and "ol" (for the alcohol).
- The correct name is "3-chloro-2-butanol".

### Final Answer:
The correct IUPAC name for 2-chlorobutan-3-ol is **3-chloro-2-butanol**.

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