When the given figure is folded to form a cube, then which face will be on the opposite place of 4?

Concept: According to the rules, alternate faces are the opposite faces and no two opposite faces touch each other.

So, here, (6, 3); (4, 5); and (1, 2) are the alternate as well as opposite faces as shown below:

So, the pairs of opposite faces – (6$$\iff$$​3); (4$$\iff$$​5); (1$$\iff$$​2).

So, the opposite face of 4 is 5.

Thus, the correct answer is option (b).