Lewis acidity of BCl 3, BPh 3 and BMe 3 with respect to pyridine follows the order

Question

Lewis acidity of BCl 3, BPh 3 and BMe 3 with respect to pyridine follows the order (A) BCl 3> BPh 3> BMe 3 (B) BMe 3> BPh 3> BCl 3 (C) BPh 3> BMe 3> BCl 3 (D) BCl 3> BMe 3> BPh 3

Tardigrade Admin · Accepted Answer

BCl3 → pπ-p π back bonding <img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/chemistry/e45f0631d08c82662ce57f7767b2c353-.png" /> ∴ BCl3> BPH3> BMe3

Q. Lewis acidity of $BC l_{3}, BP h_{3}$ and $BM e_{3}$ with respect to pyridine follows the order

$BC l_{3} > BP h_{3} > BM e_{3}$

$BM e_{3} > BP h_{3} > BC l_{3}$

$BP h_{3} > BM e_{3} > BC l_{3}$

$BC l_{3} > BM e_{3} > BP h_{3}$

$BC l_{3} \to p π - p π$ back bonding

$∴ BC l_{3} > BP H_{3} > BM e_{3}$

Q. Lewis acidity of BCl3​,BPh3​ and BMe3​ with respect to pyridine follows the order

BCl3​>BPh3​>BMe3​

BMe3​>BPh3​>BCl3​

BPh3​>BMe3​>BCl3​

BCl3​>BMe3​>BPh3​