The compound `C_(2)H_(4)Cl_(2)` has 2 isomers and they can be distinguished by the reaction with

Options

A. aq. KOH
B. alc.KOH
C. bromine water
D. `NaNH_(2)`

Explanation

To solve the problem, we need to identify the two isomers of the compound C₂H₄Cl₂ and determine how they can be distinguished from each other through chemical reactions.

### Step 1: Identify the Isomers
The compound C₂H₄Cl₂ can have two structural isomers:
1. **Geminal Isomer (Geminal Dihalide)**: Both chlorine atoms are attached to the same carbon atom. The structure is CHCl₂-CH₂.
2. **Vicinal Isomer (Vicinal Dihalide)**: The chlorine atoms are attached to adjacent carbon atoms. The structure is CH₂Cl-CHCl.

### Step 2: Write the Structures
- **Geminal Isomer**:
\[ \text{CHCl}_2-\text{CH}_2 \]

- **Vicinal Isomer**:
\[ \text{CH}_2\text{Cl}-\text{CHCl} \]

### Step 3: Determine the Reaction Conditions
To distinguish between these two isomers, we will consider various reagents. The key is to find a reagent that reacts differently with each isomer.

### Step 4: Test with Aqueous KOH
When we react both isomers with aqueous KOH, we can observe the following:
- **Geminal Isomer**:
- The reaction will lead to the formation of an alcohol (due to the substitution of Cl with OH).

- **Vicinal Isomer**:
- The reaction will also lead to the formation of an alcohol, but due to the different arrangement of chlorine, it will form a different product (aldehyde).

### Step 5: Analyze the Products
- The product from the geminal isomer will be a primary alcohol.
- The product from the vicinal isomer will yield an aldehyde after dehydration.

### Step 6: Compare Boiling Points
- The boiling point of the alcohol (from the geminal isomer) will be greater than that of the aldehyde (from the vicinal isomer).

### Conclusion
Thus, the two isomers of C₂H₄Cl₂ can be distinguished by their reaction with aqueous KOH, leading to different products (alcohol vs. aldehyde) and differing boiling points.

### Final Answer
The compound C₂H₄Cl₂ has 2 isomers that can be distinguished by the reaction with **aqueous KOH**.

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