The tendency of BF3, BCl3 and BBr3 to behave as Lewis acid decreases in the sequence

Question

The tendency of BF3, BCl3 and BBr3 to behave as Lewis acid decreases in the sequence (A) BF3 > BCl3 > BBr3 (B) BCl3 > BF3 > BBr3 (C) BBr3 > BCl3 > BF3 (D) BBr3 > BF3 > BCl3

Tardigrade Admin · Accepted Answer

As the extent of pπ - pπ back bonding decreases, electron-deficiency increases and hence the Lewis acid strength increases, i.e., option (c) is correct.

Q. The tendency of $B F_{3}, BC l_{3}$ and $BB r_{3}$ to behave as Lewis acid decreases in the sequence

$B F_{3} > BC l_{3} > BB r_{3}$

$BC l_{3} > B F_{3} > BB r_{3}$

$BB r_{3} > BC l_{3} > B F_{3}$

$BB r_{3} > B F_{3} > BC l_{3}$

As the extent of $p π - p π$ back bonding decreases, electron-deficiency increases and hence the Lewis acid strength increases, i.e., option (c) is correct.

Q. The tendency of BF3​,BCl3​ and BBr3​ to behave as Lewis acid decreases in the sequence

BF3​>BCl3​>BBr3​

BCl3​>BF3​>BBr3​

BBr3​>BCl3​>BF3​

BBr3​>BF3​>BCl3​