Which of the following has/have asymmetric carbon atom?

Options

A. `H-underset(H)underset(|)overset(Cl)overset(|)(C)-underset(H)underset(|)overset(Br)overset(|)(C)-H`
B. `H-underset(H)underset(|)overset(H)overset(|)(C)-underset(H)underset(|)overset(Cl)overset(|)(C)-Cl`
C. `H-underset(H)underset(|)overset(H)overset(|)(C)-underset(H)underset(|)overset(Cl)overset(|)(C)-D`
D. `H-underset(Br)underset(|)overset(H)overset(|)(C)-underset(OH)underset(|)overset(H)overset(|)(C)-CH_(3)`

Explanation

To determine which of the given structures has or have an asymmetric carbon atom, we need to understand what an asymmetric carbon atom is. An asymmetric carbon atom, also known as a chiral carbon atom, is a carbon atom that is bonded to four different groups.

Let's analyze the structures one by one:

### Step 1: Identify the Structures
Assume we have four different structures labeled as Structure 1, Structure 2, Structure 3, and Structure 4.

### Step 2: Analyze Structure 1
- **Structure 1**: Contains a carbon atom bonded to Br, Cl, and two hydrogen atoms.
- **Analysis**: Since there are two hydrogen atoms (which are identical), this carbon atom does not have four different groups. Therefore, **Structure 1 does not have an asymmetric carbon atom**.

### Step 3: Analyze Structure 2
- **Structure 2**: Contains a carbon atom bonded to CH3 and CHCl2.
- **Analysis**: This carbon has three similar groups (two Cl atoms) and one different group (CH3). Hence, **Structure 2 does not have an asymmetric carbon atom**.

### Step 4: Analyze Structure 3
- **Structure 3**: Contains a carbon atom bonded to CH3, Cl, and deuterium (D).
- **Analysis**: Here, we have CH3, Cl, H, and D. All four groups attached to this carbon are different (CH3, Cl, H, and D). Therefore, **Structure 3 has an asymmetric carbon atom**.

### Step 5: Analyze Structure 4
- **Structure 4**: Contains a carbon atom bonded to H, OH, and CH3.
- **Analysis**: This carbon has H, OH, CH3, and another group (which could be different). Since all groups attached to this carbon are different, **Structure 4 has an asymmetric carbon atom**.

### Conclusion
Based on the analysis:
- **Structure 1**: No asymmetric carbon atom.
- **Structure 2**: No asymmetric carbon atom.
- **Structure 3**: Has an asymmetric carbon atom.
- **Structure 4**: Has an asymmetric carbon atom.

Thus, the correct answer is that **Structure 3 and Structure 4 have asymmetric carbon atoms**.

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