Which of the following does not react with Hinsberg reagent?

Options

A. `C_(2)H_(5)NH_(2)`
B. `(C_(2)H_(5))_(2)NH`
C. `(C_(2)H_(5))_(3)N`
D. `CH_(3)NH_(2)`

Answer

To determine which of the given options does not react with Hinsberg reagent, we need to understand the behavior of different types of amines (primary, secondary, and tertiary) when they interact with this reagent.

### Step-by-Step Solution:

1. **Understanding Hinsberg Reagent**:
- Hinsberg reagent is a solution of benzenesulfonyl chloride (C6H5SO2Cl), which is used to differentiate between primary, secondary, and tertiary amines.

2. **Reactions of Amines with Hinsberg Reagent**:
- **Primary Amines**: React with Hinsberg reagent to form a sulfonamide that is soluble in alkali due to the presence of an acidic hydrogen.
- **Secondary Amines**: Also react with Hinsberg reagent but form a sulfonamide that is insoluble in alkali because they lack an acidic hydrogen.
- **Tertiary Amines**: Do not react with Hinsberg reagent. They do not form sulfonamides because they lack a hydrogen atom attached to the nitrogen that can be replaced.

3. **Identifying the Options**:
- To answer the question, we need to identify which of the given options is a tertiary amine. Tertiary amines will be the ones that do not react with the Hinsberg reagent.

4. **Conclusion**:
- Among the options provided, the one that is a tertiary amine will be the correct answer, as it does not react with Hinsberg reagent.

### Final Answer:
The option that does not react with Hinsberg reagent is the tertiary amine.

---