Identify the order in which the spin only magnetic moment ( in BM) increases for the following four ions :

Question

$\begin {array} {1 1} (I)\;Fe^{2+} & \quad (II)\;Ti^{2+} \\ (III)\;Cu^{2+} & \quad (IV)\;V^{2+} \end {array}$

$\begin {array} {1 1} (1)\;I,II,IV,III & \quad (2)\;IV,I,II,III \\ (3)\;III,IV,I,II & \quad (4)\;III,II,IV,I \end {array}$