The set which does not have ambidentate ligand(s) is :

L-isomer of tetrose $$\mathrm{X}\left(\mathrm{C}_{4} \mathrm{H}_{8} \mathrm{O}_{4}\right)$$ gives positive Schiff's test and has two chiral carbons. On acetylation, '$$\mathrm{X}$$' yields triacetate. '$$\mathrm{X}$$' also undergoes following reactions

'$$\mathrm{X}$$' is

Which of the following complex has a possibility to exist as meridional isomer?

Arrange the following compounds in increasing order of rate of aromatic electrophilic substitution reaction