A) strength as Lewis acid - \[BC{{l}_{3}}>AlC{{l}_{3}}>GaC{{l}_{3}}\]
B) inert pair effect \[-Al>Ga>In\]
C) oxidising property \[-A{{l}^{3+}}>I{{n}^{3+}}>T{{l}^{3+}}\]
D) first ionization enthalpy \[-B>Al>Tl\]
Correct Answer: A
Solution :
: Lewis acid strength decreases down the group.
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