The correct answer is option 2 - Mutual opposition to racial discrimination. The other options, 1, 3, and 4, are features of Panchsheel.

1. Mutual non-aggression: This feature of Panchsheel promotes peaceful relations between nations by ensuring that each country agrees to not use aggression or force against each other. This helps maintain stability and prevents conflicts.

2. Mutual opposition to racial discrimination: Although this option is incorrect, it is important to note that racial discrimination is generally opposed on a global level. However, it is not specifically mentioned as a feature of Panchsheel.

3. Equality and mutual benefit: This principle emphasizes the importance of treating all nations equally and ensuring mutual benefit in the relations between countries. It promotes fairness and cooperation among nations.

4. Non-interference in each other’s internal affairs: Panchsheel advocates for respecting the sovereignty of each country by not interfering in their internal matters. This principle ensures that countries have the freedom to govern themselves without external interference.

In summary, option 2 is the correct answer as it is not a feature of Panchsheel. The other options, 1, 3, and 4, are all principles that are associated with Panchsheel.