How many persons are sitting between N and M (When counted from left of M)?
Only two persons are sitting between I and K. P sits to the immediate left of K. 
L sits opposite to K. L is not the immediate right of I. Since case (2) is not possible. 
Only three persons are sitting between O and J. M sits to the immediate left of J. M is not the immediate neighbour of K. M is an immediate neighbour of L and does not sits at any of the corners. 
So the final arrangement is, 
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