Explanation:

- Six friends are sitting in a regular hexagon, facing the center.

- Apurva is between Onkar and Parth.

- Abhishek is next to Onkar.

- Kiran isn't opposite Apurva.

Let's arrange them based on these clues:

1. Apurva is between Onkar and Parth: (Onkar - Apurva - Parth)

2. Abhishek is next to Onkar: (Abhishek - Onkar - Apurva - Parth)

3. Kiran cannot be opposite Apurva.

- The initial arrangement could be: Abhishek - Onkar - Apurva - Parth - Kiran - Viraj.

- When Viraj and Onkar swap, the new arrangement is: Abhishek - Viraj - Apurva - Parth - Kiran - Onkar.

- In this arrangement, Onkar is next to Kiran.

Therefore, the correct option is:

Option 1: Onkar