The catalyst used in the manufacture of SBR is

Options

A. Pt
B. Ni
C. coke
D. Na

Answer

To determine the catalyst used in the manufacture of Styrene-Butadiene Rubber (SBR), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Composition of SBR**:
- SBR is a copolymer made from two monomers: styrene and 1,3-butadiene.

2. **Identify the Reaction Process**:
- The polymerization process involves the copolymerization of 1,3-butadiene and styrene.

3. **Identify the Catalysts Used in Polymerization**:
- Various catalysts can be used in polymerization reactions. However, for the specific case of SBR, we need to identify the correct catalyst.

4. **Examine the Options Given**:
- The options provided are: platinum, nickel, coke, and sodium.

5. **Recall the Role of Sodium in SBR Production**:
- Sodium (Na) is known to be used as a catalyst in the polymerization of 1,3-butadiene and styrene to produce SBR.

6. **Eliminate Incorrect Options**:
- Platinum, nickel, and coke are typically used in hydrogenation reactions, not in the polymerization of SBR. Therefore, they can be eliminated.

7. **Conclude the Correct Answer**:
- The correct catalyst used in the manufacture of SBR is sodium (Na).

### Final Answer:
The catalyst used in the manufacture of SBR is sodium (Na).

---