Which ion exhibits the maximum Lewis acid cha | vedclass

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(A) Lewis acid is defined as an electron-pair acceptor. According to Fajan's rule and the concept of charge density,the Lewis acidity of a cation incr

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$B^{3+}$

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(A) Lewis acid is defined as an electron-pair acceptor. According to Fajan's rule and the concept of charge density,the Lewis acidity of a cation increases with an increase in positive charge and a decrease in ionic size. Comparing the given ions: $B^{3+}$ has a high positive charge $(+3)$ and a very small ionic radius. $Li^{+}$,$Na^{+}$,and $Cs^{+}$ have a $+1$ charge and larger ionic radii compared to $B^{3+}$. Due to the highest charge-to-size ratio,$B^{3+}$ has the strongest tendency to accept electron pairs,making it the strongest Lewis acid among the options.

Which ion exhibits the maximum Lewis acid character?

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