The number of chiral centers present in 3, 4-dibromo-2-pentanol is

Options

A. 1
B. 2
C. 3
D. 4

Explanation

To determine the number of chiral centers in 3,4-dibromo-2-pentanol, we will follow these steps:

### Step 1: Understand the Structure
First, we need to understand the structure of 3,4-dibromo-2-pentanol. The name indicates that we have a pentane chain (5 carbon atoms) with a hydroxyl (OH) group at the 2nd position and bromine (Br) atoms at the 3rd and 4th positions.

### Step 2: Draw the Structure
We can draw the structure based on the name:
- The carbon chain is numbered from 1 to 5.
- At carbon 2, we place the OH group.
- At carbon 3 and carbon 4, we place the Br atoms.

The structure looks like this:
```
Br
|
CH3-CH-CH-CH-CH3
| |
OH Br
```

### Step 3: Identify Chiral Centers
A chiral center (or chiral carbon) is a carbon atom that is bonded to four different groups. Now, we will analyze each carbon atom in the structure:

1. **Carbon 1**: Has three hydrogen atoms and one carbon chain (not chiral).
2. **Carbon 2**: Has four different groups (OH, H, CH3, and the rest of the carbon chain) (chiral).
3. **Carbon 3**: Has four different groups (Br, H, CH2 from carbon 2, and the rest of the carbon chain) (chiral).
4. **Carbon 4**: Has four different groups (Br, H, CH2 from carbon 3, and the rest of the carbon chain) (chiral).
5. **Carbon 5**: Has three hydrogen atoms and one carbon chain (not chiral).

### Step 4: Count the Chiral Centers
From our analysis, we have identified that:
- Carbon 2 is chiral.
- Carbon 3 is chiral.
- Carbon 4 is chiral.

Thus, there are **3 chiral centers** in 3,4-dibromo-2-pentanol.

### Final Answer
The number of chiral centers present in 3,4-dibromo-2-pentanol is **3**.

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