1) Dilip is second to the left of Manohar and Karun is sitting diagonally to Dilip.
2) Jayanth is not at the end of any row the neighbour of Karun means Jayanth sitting in the middle of the row and Biswanth is the neighbour of Manohar.
3) After interchanging the position of Dilip with Jayanth the arrangement is as follow-