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

Options

A. Strength as Lewis acid `-BCl _(3) gt Al Cl _(3) gt Ga Cl _(3)`
B. Inert pair effect `- Al gt Ga gt ln`
C. Oxidising property `- Al ^(3+) gt ln ^(3+) gt Ti ^(3+)`
D. First ionisaiton enthalpy `- B gt Al gt Ti`

Answer

D

Explanation

As we know on moving down the group first ionization enthalpy decreases top to bottom therefore order of first ionization enthalpy for group 13 element is
`B gt Al gt Ga gt In gt Tl`