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Identifying the existence of specific functional groups in MXenes is adifficult topic that has perplexed researchers for a long time. We show in thispaper that in the case of magnetic MXenes, the magneto-transport properties ofthe material provide an easy solution. One of the fascinating properties thatMXenes offer is the realization of intrinsic ferromagnetism which is importantfor two-dimensional (2D) materials family. The previous reports have only madea few statements on some MXenes citing its usefulness for spintronics relatedapplications. Here, using first-principle calculations we have examined theactual magneto-transport phenomena in MXenes family. We have considered allpossible combinations of 3\textit{d} transition metals ($Ti, V, Cr$ and $Mn$)and nitride based functionalized $(O_2, F_2$ and $(OH)_2$) MXenes, $M_2NT_2$.The intrinsic anomalous Hall effect is investigated in $Cr$ and $Mn$ basedMXenes as the compounds possess ground state stable ferromagnetic solutions. Wedemonstrate that intrinsic Anomalous Hall conductivity (AHC) can be used toidentify the functional groups in MXenes.  Additionally, half-metallic features of these ferromagnetic MXenes make thempotential candidates for varieties of applications such as in logic and memorydevices, quantum computations, spintronics etc. The maximum anomalous Hallconductivity (AHC) at Fermi energy, $E_F$, is found in case of $Mn_2NO_2$ (470$S/cm$) which is attributed to the presence of avoided band crossing and largerdensity of states. Together, when considered all the studied systems, the AHCcan be above 2500 $S/cm$ within $E_F \pm $ 0.25 $eV$. Our findings could beuseful not only in guiding the experimentalists by considering AHC as a simpletool in determining the functional groups in 2D ferro(i)magnets, also, it couldbe useful in designing memory device with negligible stray fields.

Surface-oxygen-passivation driven large anomalous Hall conductivity  (AHC) in nitride MXenes: Can AHC be a tool to determine functional groups in  2D ferro(i)magnets?