In a given number 1234567891, we interchange the first and second digits, the third and fourth digits, and so on. Then, which digit will be sixth from the right?

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1. **Understand the process of digit interchange**:  
   The digits in the number **1234567891** are interchanged in pairs:  
   - The first digit swaps with the second, the third swaps with the fourth, and so on.

2. **Perform the interchange**:  
   After swapping:  
   - First pair (1 and 2): **21**  
   - Second pair (3 and 4): **43**  
   - Third pair (5 and 6): **65**  
   - Fourth pair (7 and 8): **87**  
   - Last digit remains unchanged (9 and 1): **91**

The resulting number is **2143658791**.

3. **Find the sixth digit from the right**:  
   Count six digits from the right in **2143658791**:  
   - Starting from the right: 1 → 9 → 7 → 8 → 5 → **6**.

4. **Conclusion**:  
   The sixth digit from the right is **6**, making the correct answer **(d)**.

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