The melting point of drug $$ A(1 S, 2 R) $$ is $$ 160-165^{\circ} \mathrm{C} $$. Compare the melting point range of the drug $$ A $$ to drug $$ B(1 S, 2 S) $$ and drug $$ C(1 R, 2 S) $$. $$ A^{\prime}, B $$, and $$ C $$ has identical range. A and $$ B $$ has identical range, $$ A $$ and $$ C $$ has different range. All three drugs have different range. A and $$ B $$ has different range, $$ A $$ and $$ C $$ has same range.

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To determine the melting point ranges of drugs $$ A $$, $$ B $$, and $$ C $$, let's analyze their stereochemistry and its impact on their physical properties.

### Given:
- **Drug $$ A $$**: $$ (1S, 2R) $$ with a melting point range of $$ 160-165^{\circ} \mathrm{C} $$
- **Drug $$ B $$**: $$ (1S, 2S) $$
- **Drug $$ C $$**: $$ (1R, 2S) $$

### Stereochemical Relationships:
1. **Enantiomers**: Molecules that are non-superimposable mirror images of each other. They have identical physical properties, including melting points.
2. **Diastereomers**: Molecules that are not mirror images of each other. They generally have different physical properties, including different melting points.

### Analysis:
- **Drug $$ A $$ and Drug $$ C $$**:
  - **Configurations**: $$ A $$ is $$ (1S, 2R) $$ and $$ C $$ is $$ (1R, 2S) $$.
  - **Relationship**: These are **enantiomers**.
  - **Melting Point**: They will have **identical melting point ranges**.

- **Drug $$ A $$ and Drug $$ B $$**:
  - **Configurations**: $$ A $$ is $$ (1S, 2R) $$ and $$ B $$ is $$ (1S, 2S) $$.
  - **Relationship**: These are **diastereomers**.
  - **Melting Point**: They will have **different melting point ranges**.

### Conclusion:
- **A and $$ B $$** have **different** melting point ranges.
- **A and $$ C $$** have the **same** melting point range.

**Correct Option:**
- **A and $$ B $$ has different range, $$ A $$ and $$ C $$ has same range.**

**Answer:** A and B has different range, A and C has same range.
A and B have different melting point ranges, while A and C have the same melting point range.

The melting point of drug is . Compare the melting
point range of the drug to drug and drug .
, and has identical range.
A and has identical range, and has different range.
All three drugs have different range.
A and has different range, and has same range.

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The melting point of drug is . Compare the melting point range of the drug to drug and drug . , and has identical range. A and has identical range, and has different range. All three drugs have different range. A and has different range, and has same range.