5 chess puzzles to challenge the mind

(solutions in the end)
1)
white mates in 2 (find key move)
2)
white mates in 2
3)
white plays and mates in 3
4)
white mates in 2 (find the first move that will promise this no matter what black does)
5)
white mates in 2 (find key move)
anyone looking for more normal puzzles can find quite a few here
solution 1: (rook from h7 to g7)
solution 2: (rook from c3 to c8 , black king takes pawn , queen from c1 to c7)
solution 3: (queen from b1 to a2 , black pawn must take queen(only move) ,
bishop from d3 to f5 , black king must take bishop , knight from e6 to g7 checkmate)
solution 4: (rook from e6 to e1 will promise a checkmate in the next move)
solution 5: (knight from g8 to e7)