Select the box that cannot be formed by folding the given unfolded box. Question figure:

Every alternate positions in an open dice are opposite to each other.   1 ↔ 3  are opposite to each other 4 ↔ 6  are opposite to each other 2 ↔ 5  are opposite to each other Thus, option (1) is not possible because 2 is opposite to 5, not adjacent.