OSPF Multi-hop, running bgp without ip address on physical

I have two questions
1. R1(OSPF)-----------R2-----------R3(OSPF)

R1 and R3 are running ospf and R2 is not running it, is it possible to R1
and R3 to form adj.
(don't suggest tunneling )

2. (loopback0)R1[e0/0]------------------[e0/0]R2(loopback0)

Both the routers run bgp using their loopback as the neighbor and update
source
but the physical interfaces doesn't have any ip address, are the routers
will be neighbors?
(no ip unnumbered)

Please reply.

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Rahul Kulkarni
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