Find the odd one out from the following.

Let's check the positional differences between adjacent letters in each option:
* ACEG:
$A(1)\stackrel{+2}{\to }C(3)\stackrel{+2}{\to }E(5)\stackrel{+2}{\to }G(7)$ (Constant difference of $+2$)
* HJLN:
$H(8)\stackrel{+2}{\to }J(10)\stackrel{+2}{\to }L(12)\stackrel{+2}{\to }N(14)$ (Constant difference of $+2$)
* TVXZ:
$T(20)\stackrel{+2}{\to }V(22)\stackrel{+2}{\to }X(24)\stackrel{+2}{\to }Z(26)$ (Constant difference of $+2$)
* MNOL:
$M(13)\stackrel{+1}{\to }N(14)\stackrel{+1}{\to }O(15)\stackrel{-3}{\to }L(12)$ (Pattern is completely different)

Thus, MNOL is the odd one out.