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  4. The relative strengths of trichlorides of boron group to accept a pair of electron is given by

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Q. The relative strengths of trichlorides of boron group to accept a pair of electron is given by

KEAMKEAM 2015The p-Block Elements

Solution:

Lewis acidic strength is in the order

$Ga X_{3}< Al X_{3}< B X_{3}$

So, acidic strength of trichlorides is as follows:

$GaCl _{3}< AlCl _{3}< BCl _{3}$

Hence, strength of accepting electron is as follows:

$GaCl _{3}> AlCl _{3}> BCl _{3}$