Which of the following structures represent meso compound?

Options

A.
B.
C.
D.

Explanation

To determine which of the given structures represents a meso compound, we need to follow a systematic approach based on the characteristics of meso compounds. Here’s a step-by-step solution:

### Step 1: Understand the Definition of Meso Compounds
Meso compounds are a type of stereoisomer that have multiple stereocenters but are superimposable on their mirror images due to an internal plane of symmetry.

### Step 2: Identify the Conditions for Meso Compounds
1. **Presence of Stereocenters**: A meso compound must have at least two stereocenters.
2. **Plane of Symmetry**: There must be a plane of symmetry within the molecule.

### Step 3: Analyze Each Option
Let's analyze the given structures one by one to check for the presence of stereocenters and a plane of symmetry.

#### Option 1:
- Check for stereocenters: If all substituents around the stereocenters are different, it cannot be a meso compound.
- Check for symmetry: If there is no plane of symmetry, it cannot be a meso compound.

#### Option 2:
- Check for stereocenters: Similar analysis as above.
- Check for symmetry: Presence of different atoms (like oxygen) can disrupt symmetry.

#### Option 3:
- Check for stereocenters: Identify if there are two stereocenters.
- Check for symmetry: Look for a plane of symmetry. If you can find a plane that divides the molecule into two equal halves, then it is a meso compound.

#### Option 4:
- Check for stereocenters: Analyze the substituents.
- Check for symmetry: If there is no symmetry, it cannot be a meso compound.

### Step 4: Conclusion
After analyzing all options:
- **Option 3** shows both the presence of two stereocenters and a plane of symmetry, fulfilling the criteria for a meso compound.

Thus, the correct answer is **Option 3**.