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

Study the following information carefully to answer the given question: Nine persons
i.e. A, Z, B, Y, C, N, M, Q and J live on a separate floor of a nine floored building but not necessarily in the same order. The ground floor is numbered as 1, the first floor is numbered as 2 and so on until the topmost floor is numbered as 9. A does not live on the odd numbered floor and doesn’t live just below of the top floor. There are two persons live between A and N, who lives above of the floor in which A lives. Z lives just above of the floor of Q. B lives just below of the floor of J. There are three persons live between N and M, who lives just above the floor of Y. Both B and Q do not live on ground floor. Q lives below of the floor of Y but not just below. The number of persons between J and M is same as between C and Y.