Arrange the silicon halides into decreasing order of Lewis acids Character? SiF4, SiCl4, SiBr4, SiI4

In case of silicone halides inductive effect dominate over back bonding hence Lewis acid character decided by inductive effect.

Hence order of Lewis acid character:

                                      [SiF₄>SiCl₄> SiBr₄ > SiI₄]

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