Four of the following five are alike in a certain way and hence form a group. Which is the one that does not belong to the group?

Study the following information carefully and answer the questions given below: C, D, E, F, G, H, I, J and K are nine people who live in a multi – storey building on different floors. The ground floor is number 1, the floor above is number 2 and so on, and the topmost floor is number 9. In the building meeting all of people were seated facing in two rows such that five in one row and four in other, one place was vacant in the row of four people. These people were facing each other in the linear seating arrangement (means one row is facing north and another row people south). The persons at the extreme ends of the north facing row are immediately next to each other’s floor. K lives on the top floor and sits opposite to the vacant place. The person living on the 5th floor sits opposite to H and faces north. J and C live immediately next to each other’s floor with J above C’s floor and both sit opposite to each other. G is not immediately next to D’s floor. D sits third to the right of J and F is in the middle of the North facing people’s row. C sits to the left of H. J does not live on 8th or 7th floor. H and E sit at the extreme ends of the row and face south; also they are immediately next to each other’s floor. G lives on the 3rd floor and faces south. D does not sit adjacent to the vacant place. There are exactly three floors between K and
I.