1. The problem asks: Which angle is vertical to $\angle 2$? 2. Vertical angles are pairs of opposite angles made by two intersecting lines. They are equal in measure. 3. Given two intersecting lines forming six angles labeled 1 through 6, $\angle 2$ is between $\angle 3$ and $\angle 6$. 4. The vertical angle to $\angle 2$ is the angle directly opposite it across the intersection point. 5. According to the description, $\angle 5$ is opposite $\angle 2$ across the intersection. 6. Therefore, the vertical angle to $\angle 2$ is $\angle 5$. Final answer: $\boxed{\angle 5}$