which type of process is generally favored by a multilevel feedback
queuing scheduler-a processor-bound process or an I/O bound process?
why?

There is a discussion of Multilevel Feedback Queue Scheduling at:

http://www.uwm.edu/People/nataliya/project_files/multilevel_queue_scheduling.htm

The following excerpts indicate that the answer to your question is
that this kind of scheduler favors I/O bound processes.

"In this approach to process scheduling the ready queue is partitioned
into multiple queues of different priorities. The system tends to
assign processes to queues based on their CPU burst characteristics:
if a process consumes too much CPU time it is placed onto a lower
priority queue. Thus I/O-bound and interactive processes stay in the
higher priority queues and CPU-bound processes gravitate to the lower
priority queues."

"Multilevel feedback queue scheduling allows a process to move between
queues. This is fair for I/O-bound processes, they don't have to wait
too long."