A) \[{{\operatorname{BX}}_{3}} > AI{{X}_{3}} > Ga{{x}_{3}} > In{{X}_{3}}\]
B) \[B{{X}_{3}}<AI{{X}_{3}}<Ga{{X}_{3}}<In{{X}_{3}}\]
C) \[{{\operatorname{BX}}_{3}} < AI{{X}_{3}} > Ga{{X}_{3}} < In{{X}_{3}}\]
D) \[{{\operatorname{BX}}_{3}}<AI{{X}_{3}}>Go{{X}_{3}}>In{{X}_{3}}\]
Correct Answer: A
Solution :
Electronegativity of central metal decreases. electron accepting tendency decreases lewis acidic strength decreases Greater the electronegativity of central metal greater the electron density accepting ability. Hence greater lewis acidic strength.
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