For all of the aforementioned properties, data for all DFAs employed are displayed in scatter plots or histograms sorted by group hierarchy. For visualization of predicted HCNO equilibrium bond angles, a 3D histogram is presented in Figure for qe(H-C-N) and Figure for qe(C-N-O). For the scatter plots of each group, a box and whisker plot is overlaid showing the maximum, minimum, median, and quartiles for each group (five-number summary), and the corresponding benchmark result for each property is displayed with a vertical line. Scatter plots for ΔEe(rxn), re(N-O), ω3, ω5, Δre(H-C), and Δω(C-N str.) are provided in Figures , whereas scatter plots for re(H-C), re(C-N), ω1, ω2, ω4a, ω4b, Δre(C-N), and Δω(H-C str.) appear in Figures S2-S9 in the SI. Results from a pruned subset of 34 functionals have been selected for presentation and discussion in the main text. This subset comprises DFAs cited for robust performance by Goerigk and coworkers, Mardirossian and Head-Gordon, and Verma and Truhlar, as well as a majority of the most popular functionals per a 2023 DFT poll organized by Swart, Bickelhaupt, and Duran. For this pruned subset, we present Tables and detailing optimized bond distances and harmonic vibrational frequencies for linear and bent HCNO minima. For DFAs that produced a bent minimum, the barrier to linearity, optimized structure, and frequencies of the linear HCNO transition state are provided in Table . Table lists values for ΔEe(rxn) along with percentiles for the ΔEe(rxn), re, and Δre quantities, while Table gives analogous results for the vibrational frequencies. When assessing qe(H-C-N) within our pruned lists in Tables and, the same trends emerge. Excluding MN12-L, all 14 DFAs in Groups 1 and 2, namely the GGAs and meta-GGAs, produce bent minima while all 15 hybrid functionals (Groups 3-5) produce linear minima. Among the three Group 6 double-hybrids, B2GP-PLYP-D3(BJ)2B produces a linear minimum, while DSD-BLYP-D3(BJ) and DSD-PBEP86-D3(BJ) produce bent structures with tiny EB values of 0.23 and 4.32 cm -1 , respectively (Table ). For Groups 1-5, the percentage of DFAs producing linear minima shows continuous increase as the DFT ladder is climbed; however, at the top of the ladder, the Group 6 double-hybrids only produce a linear structure in 67% of cases. It is thus substantiated that the inconsistencies of these DFT methods fail to provide any consensus or convergence on the delicate ω5 bending frequency and thus do not provide insight into the intricacies of the fulminic acid quasibent/quasilinear problem.