The most likely acid-catalysed aldol condensation products of each...

(\left[F e F_{6}\right]^{3-}) complex ion possesses sp $^{3} d^{2}$ hybridization. The electronic configurations of $C r, F e, C o$ and $T i$ in the complexes are $(3 d)^{3},(3 d)^{5},(3 d)^{6}$ and $(3 d)^{1}$, respectively. These involve $d^{2} s p^{3}, s p^{3} d^{2}, d^{2} s p^{3}$ and $d^{2} s p^{3}$ hybridization respectively.