If the world was without evil, how do you explain the existence of the serpent? The serpent used deceit (evil) to tempt (evil) Eve into disobeying (evil) God.Furthermore, if we presume that no evil existed in the world, how was Eve to know the difference between right and wrong?
Well, the world was without evil of man. The spirit of man was good and not corrupted. The land, the animals and basically everything was good.
There was one fallen cherub in lucifer who did deceive them but Lucifer doing wrong would not get them punished. They would have still been able to live in paradise had they not disobey.
They didnt need to know what evil was to know the difference between right and wrong. They were already told what it was.
There are many things that have a right or wrong and one needn't know evil to decipher that.