Which of the following pairs of compounds have similar chemical properties?

Options

A. `H-underset(H)underset(|)overset(H)overset(|)C-Cl" "H-underset(H)underset(|)overset(H)overset(|)C-underset(H)underset(|)overset(H)overset(|)C-Cl`
B. `H-underset(H)underset(|)overset(H)overset(|)C-underset(H)underset(|)overset(H)overset(|)C-H" "H-underset(H)underset(|)overset(H)overset(|)C-overset(H)overset(|)C=overset(H)overset(|)C-H`
C. `H-underset(H)underset(|)overset(H)overset(|)C-underset(H)underset(|)overset(H)overset(|)C-O-H" "H-underset(H)underset(|)overset(H)overset(|)C-overset(O)overset(||)C-O-H`
D. `H-underset(H)underset(|)overset(H)overset(|)C-underset(H)underset(|)overset(H)overset(|)C-Cl" "H-underset(H)underset(|)overset(H)overset(|)C-overset(O)overset(||)C-Cl`

Explanation

To determine which pairs of compounds have similar chemical properties, we need to analyze the functional groups present in each pair. Compounds with the same functional group typically exhibit similar chemical behavior.

### Step-by-Step Solution:

1. **Identify the Functional Groups**:
- For each pair of compounds, identify the functional groups present.
- Example: If the pair is (A) R-Cl and (B) R-Br, both compounds have a halogen functional group.

2. **Compare the Functional Groups**:
- Check if both compounds belong to the same family or class based on their functional groups.
- Example: Alcohols (R-OH) and carboxylic acids (R-COOH) are different classes and will have different properties.

3. **Analyze the Options**:
- **Option 1**: Both compounds have chlorine (Cl) as a functional group. They belong to the same family, suggesting similar properties.
- **Option 2**: One compound is an alkane (saturated) and the other is an alkene (unsaturated). These will have different properties.
- **Option 3**: One compound is an alcohol and the other is a carboxylic acid. These have different functional groups and thus different properties.
- **Option 4**: One compound has a carbonyl group (C=O) and the other has a chlorine atom. Different functional groups mean different properties.

4. **Conclusion**:
- Based on the analysis, **Option 1** is the correct answer as both compounds share the same functional group (chlorine) and thus have similar chemical properties.

### Final Answer:
**Option 1** has the compounds with similar chemical properties.

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