Sphenopsida is represented by Equisetum, whereas Adiantum belongs to Pteropsida.
So the pair Sphenopsida – Adiantum is the incorrect one.
Pteropsida – Dryopteris is correct, as Dryopteris (a fern) belongs to Pteropsida.
Psilopsida – Psilotum is correct, as Psilotum belongs to Psilopsida.
Lycopsida – Selaginella is correct, as Selaginella belongs to Lycopsida.
Hence, the incorrect pair is Sphenopsida – Adiantum.
