The correct order of the first ionization ent | vedclass

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(D) $(i)$ The first ionization enthalpy $(IE_1)$ decreases down the group from $B$ to $Al$ due to an increase in atomic size. $(ii)$ From $Al$ to $Ga$

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$Tl > Ga > Al$

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(D) $(i)$ The first ionization enthalpy $(IE_1)$ decreases down the group from $B$ to $Al$ due to an increase in atomic size. $(ii)$ From $Al$ to $Ga$,the $IE_1$ increases due to the poor shielding effect of $d$-electrons (scandide contraction). $(iii)$ From $Ga$ to $Tl$,the $IE_1$ increases due to the poor shielding effect of $f$-electrons (lanthanide contraction). $(iv)$ Combining these trends,the correct order is $Tl > Ga > Al$.

The correct order of the first ionization enthalpy is

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