In which of the following options the order of
arrangement does not agree with the variation of
property indicated against it ?
(1) ``\ce {Al^3+ < Mg^2+ < Na+ < F- } ``(increasing ionic size)
(2) B < C < N < O (increasing first ionisation enthalpy)
(3) I < Br < Cl < F (increasing electron gain
enthalpy)
(4) Li < Na < K < Rb (increasing metallic radius)