Out of the following which are chiral ?

Options

A.
B.
C.
D.

Answer

To determine which compounds are chiral from the given options, we need to analyze each compound based on the presence of a plane of symmetry (POS) and the uniqueness of the groups attached to the chiral centers. Here’s a step-by-step solution:

### Step 1: Understand Chirality
Chirality refers to a property of a molecule that is not superimposable on its mirror image. A compound is chiral if it has at least one carbon atom bonded to four different groups (a chiral center) or if it lacks a plane of symmetry.

### Step 2: Analyze Each Compound
Let's denote the compounds as A, B, C, and D.

#### Compound A:
- **Observation**: There are two CH3 groups, one above the plane and one below.
- **Analysis**: Since both CH3 groups are identical, a plane can be drawn that divides the molecule symmetrically, indicating the presence of a plane of symmetry.
- **Conclusion**: Compound A is **not chiral**.

#### Compound B:
- **Observation**: The groups attached to the central carbon are different (e.g., CH3, Cl, etc.).
- **Analysis**: No plane of symmetry can be drawn that divides the molecule into two identical halves. The groups are arranged in such a way that they do not mirror each other.
- **Conclusion**: Compound B is **chiral**.

#### Compound C:
- **Observation**: Similar to compound B, the groups attached are different.
- **Analysis**: A plane cannot be drawn that divides the molecule symmetrically. The arrangement of groups does not allow for a mirror image.
- **Conclusion**: Compound C is **chiral**.

#### Compound D:
- **Observation**: The groups are arranged such that they can be mirrored.
- **Analysis**: A plane can be drawn that divides the molecule symmetrically, indicating the presence of a plane of symmetry.
- **Conclusion**: Compound D is **not chiral**.

### Final Answer:
The chiral compounds among the options are **B and C**.

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