isomera of a compound must have

Options

A. Same physical properties
B. Same chemical properties
C. Same sturtural properties
D. Same molecular properties

Answer

To answer the question "Isomers of a compound must have," we need to analyze the characteristics of isomers. Isomers are compounds that have the same molecular formula but different structural formulas or arrangements of atoms. Let's break down the options provided in the question step by step.

### Step-by-Step Solution:

1. **Understanding Isomers**:
- Isomers are compounds that have the same molecular formula but differ in the arrangement of atoms. This means they can have different physical and chemical properties.

2. **Analyzing the Options**:
- **Option A: Same physical properties**: This option is incorrect. Isomers can have different physical properties (e.g., boiling point, melting point) due to their different structures.
- **Option B: Same chemical properties**: This option is also incorrect. Isomers can exhibit different chemical properties because they may react differently with other substances.
- **Option C: Same structural properties**: This option is incorrect as well. Isomers differ in their structural properties, meaning the way atoms are connected or arranged is different.
- **Option D: Same molecular properties**: This option is correct. Isomers have the same molecular formula, which means they have the same molecular properties (e.g., the same number of atoms of each element).

3. **Conclusion**:
- The correct answer is **Option D: Same molecular properties**. Isomers must have the same molecular formula but can differ in physical, chemical, and structural properties.

### Final Answer:
Isomers of a compound must have the same molecular properties.