Which of the following will give enantiomeric pair on reaction with water due to presence of asymeteric carbon atom?

Options

A. `C_2H_5-underset(C_2H_5)underset(|)overset(C_2H_5)overset(|)C-Br`
B. `C_2H_5-underset(CH_3)underset(|)overset(C_2H_5)overset(|)C-Cl`
C. `C_2H_5-underset(CH_3)underset(|)overset(H)overset(|)C-I`
D. `CH_3-underset(C_2H_5)underset(|)overset(CH_3)overset(|)C-Br`

Explanation

To determine which of the given options will yield an enantiomeric pair upon reaction with water due to the presence of an asymmetric carbon atom, we can follow these steps:

### Step 1: Understand Key Concepts
- **Enantiomeric Pair**: These are molecules that are non-superimposable mirror images of each other. They typically arise from chiral centers (asymmetric carbon atoms).
- **Asymmetric Carbon Atom**: A carbon atom that is bonded to four different groups, making it chiral.

### Step 2: Analyze Each Option
We will evaluate each option to identify if it contains an asymmetric carbon atom.

#### Option A:
- Structure: Carbon attached to three ethyl groups and one bromide group.
- Analysis: The three ethyl groups are identical. Therefore, this carbon is not asymmetric and cannot form an enantiomeric pair.

#### Option B:
- Structure: Carbon attached to two ethyl groups and one methyl group.
- Analysis: The two ethyl groups are identical. Thus, this carbon is not asymmetric and cannot form an enantiomeric pair.

#### Option C:
- Structure: Carbon attached to one hydrogen, one ethyl group, one methyl group, and one iodide group.
- Analysis: All four groups attached to this carbon are different (H, C2H5, CH3, I). Therefore, this carbon is asymmetric and can form an enantiomeric pair upon reaction with water.

#### Option D:
- Structure: Carbon attached to two methyl groups and one bromide group.
- Analysis: The two methyl groups are identical. Hence, this carbon is not asymmetric and cannot form an enantiomeric pair.

### Step 3: Conclusion
Based on the analysis, only **Option C** has an asymmetric carbon atom and will yield an enantiomeric pair upon reaction with water.

### Final Answer:
The correct option is **C**.

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