The amine which can react with `C_(6)H_(5)-SO_(2)-Cl` to form a product insoluble in alkali shall be

Options

A. Primary amine
B. Secondary amine
C. Tertiary amine
D. Both primary and secondary amines.

Explanation

To solve the problem, we need to determine which type of amine reacts with benzene sulfonyl chloride (C6H5SO2Cl) to form a product that is insoluble in alkali.

### Step-by-Step Solution:

1. **Identify the Reactants**:
The reactant is benzene sulfonyl chloride (C6H5SO2Cl), which is a sulfonyl chloride. The amines we are considering are primary amines (RNH2), secondary amines (R2NH), and tertiary amines (R3N).

2. **Understand the Reaction Mechanism**:
- Benzene sulfonyl chloride reacts with amines through a nucleophilic substitution mechanism (SN2).
- The nitrogen atom in the amine (which has a lone pair of electrons) attacks the sulfur atom in the sulfonyl chloride, leading to the formation of a sulfonamide.

3. **Reactions of Different Amines**:
- **Primary Amine (RNH2)**:
When a primary amine reacts with C6H5SO2Cl, it forms a sulfonamide that is soluble in water (alkali).
- **Secondary Amine (R2NH)**:
A secondary amine will also react with C6H5SO2Cl to form a sulfonamide. However, the product formed from a secondary amine is generally less soluble in water compared to that from a primary amine.
- **Tertiary Amine (R3N)**:
Tertiary amines do not react with sulfonyl chlorides to form sulfonamides, as they lack a hydrogen atom on nitrogen to participate in the reaction.

4. **Determine the Solubility in Alkali**:
- The product formed from a primary amine is soluble in alkali due to the formation of a salt.
- The product from a secondary amine, however, is typically insoluble in alkali because it does not form a soluble salt.

5. **Conclusion**:
Based on the above analysis, the amine that reacts with C6H5SO2Cl to form a product that is insoluble in alkali is a **secondary amine** (Option 2).

### Final Answer:
The amine which can react with C6H5SO2Cl to form a product insoluble in alkali is a **secondary amine**.

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