Who did Alexander the Great pass the throne to?

Answer 1

Well, on his deathbed, his subjects asked him who would inherit the empire, and he said, "the strongest". Obviously, that was not very specific, so everyone fought over who would inherit the empire, so the empire collapsed under no rule with everyone fighting.

Answer 2

Macedonian kings were elected by the warriors voting in assembly, it was not his to pass on.

There was no clear successor. His handicapped brother Philip III and his male child Alexander IV by his Persian wife Roxanne were appointed joint kings. The reality was that the generals fought for power and finally emerged setting themselves up as kings of Macedonia, of Egypt, and of Syria-Mesopotamia. The nominal kings were murdered on the sidelines of this struggle.

Answer 3

His generals calles "Diadochi". The empire was split into several pieces, there were n one sigle heir. For further information check the link.