For the properties mentioned, the correct trend for the different species is in

Question

Inert pair effect - Al > Ga > In

First ionization enthalpy - B > Al > Tl

Strength as Lewis acid - $BCl_3 > AlCl_3 > GaCl_3$

Oxidising property - $Al^{3+} > In^{3+} > Tl^{3+}$

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