Which is stronger Lewis acid,BCl3 or BF3 ? explain

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Solution

Dear Student
$A m o n g B F_{3} a n d B C l_{3} B C l_{3} i s a s t r o n g e r l e w i s a c i d . I t i s b e a c u s e i n B F_{3} F d o n a t e s l o n e p a i r o f e l e c t r o n s m o r e e a s i l y a n d s t r o n g l y w h e n c o m p a r e d t o t h C l i n B C l_{3} . T h u s e l e c t r o n d e f i c i e n c y i s m o r e i n B C l_{3} t h a n B F_{3} . H e n c e B C l_{3} i s a s t r o n g e r L e w i s a c i d .$
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