What is the ruling on congregational prayer on chairs in the mosque, while disrupting the rows or advancing beyond them, and with some being able to sit on the ground due to inability to stand?

The person praying on a chair should exert their effort to straighten the row. If they are unable, there is no blame upon them, as Allah Almighty says: "So fear Allah as much as you are able," and His saying: "Allah does not burden a soul beyond its capacity." The prayer of the person praying on a chair is invalid if they abandon sitting or prostrating while being able to do so.