Find the ODD one out from the given options.

BY  = B is in the second position of alphabetical series similarly Y  is in the second position of the reverse alphabetical series

AZ = A is in the first position of alphabetical series similarly Z  is in the first position of the reverse alphabetical series

EV = E is in the Fifth position of alphabetical series similarly V is in the fifth position of the reverse alphabetical series

CW = C is in the third position of alphabetical series similarly W is in the fourth position of the reverse alphabetical series

so CW is odd