'X' is

For compound having the formula $$\mathrm{GaAlCl}_{4}$$, the correct option from the following is :

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