Which of the following is/are meso compound:

Options

A.
B.
C.
D.

Explanation

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

### Step 1: Understand the Definition of Meso Compounds
A meso compound is a molecule that:
1. Contains two or more chiral centers.
2. Has an internal plane of symmetry, making it superimposable on its mirror image.

### Step 2: Analyze Each Compound
We will analyze each option provided to see if they meet the criteria for being a meso compound.

#### Option A:
- Identify chiral centers: Check the structure for chiral carbons.
- Check for symmetry: Look for a plane of symmetry.

**Analysis**:
- This compound has two chiral centers.
- It also has a plane of symmetry, making it a meso compound.

#### Option B:
- Identify chiral centers: Check the structure for chiral carbons.
- Check for symmetry: Look for a plane of symmetry.

**Analysis**:
- This compound also has two chiral centers.
- It has a plane of symmetry, confirming it as a meso compound.

#### Option C:
- Identify chiral centers: Check the structure for chiral carbons.
- Check for symmetry: Look for a plane of symmetry.

**Analysis**:
- This compound has two chiral centers.
- It possesses a plane of symmetry, indicating it is a meso compound.

#### Option D:
- Identify chiral centers: Check the structure for chiral carbons.
- Check for symmetry: Look for a plane of symmetry.

**Analysis**:
- This compound has two chiral centers.
- However, it lacks a plane of symmetry, which means it is not a meso compound.

### Step 3: Conclusion
Based on the analysis:
- Options A, B, and C are meso compounds.
- Option D is not a meso compound.

### Final Answer:
The meso compounds are **A, B, and C**.

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