Question

error correction: who does the dictionary that's lying on the table belong?

Answer 1

whom does the dictionary that's lying on the table belong to ?

Answer 2

The grammatically correct version of the sentence “Who does the dictionary that’s lying on the table belong?” would be “who does the dictionary that is lying on the table belong to?”

Alternatively, you can use “whom,” which would be more appropriate when referring to the object of a proposition or of a verb, and change the sentence to “To who does the dictionary that is lying the table belong?”