Qf5 is a major blunder. Can you spot why? (Answer in comments)

Hangs the queen or is mate in 2. If queen takes queen, black cant take back otherwise bishop b5 is checkmate as its double check with the bishop and the rook and its impossible to defend/escape from both as the escape squares are blocked by blacks rook and bishop.

Black is wasting tempo to offer a queen trade

Black is not developing any pieces

Even without the blunder it's just a poor move