Change this to passive voice of the verb.Many persons who like fruits prefer mango papaya?

The original sentence is grammatically incorrect and doesn't make sense. It seems like you might be asking about:

"Many persons who like fruits prefer mangoes and papayas."

Here's the sentence in the passive voice:

Mangoes and papayas are preferred by many persons who like fruits.

Let me know if you have any other sentences you'd like help with!