Lewis acidity of BCl₃, BPh₃ and BMe₃ with respect to pyridine follows the order · ABC26IN0179

Subject: Inorganic Chemistry · Chapter: Main Group Elements · Topic: Main Group Elements – General · Exam: CSIR NET 2011 · Marks: 2 · Difficulty: Medium

Lewis acidity of $\mathrm{BCl}_{3}$, $\mathrm{BPh}_{3}$ and $\mathrm{BMe}_{3}$ with respect to pyridine follows the order
(a)$\mathrm{BCl}_{3}>\mathrm{BPh}_{3}>\mathrm{BMe}_{3}$
(b)$\mathrm{BMe}_{3}>\mathrm{BPh}_{3}>\mathrm{BCl}_{3}$
(c)$\mathrm{BPh}_{3}>\mathrm{BMe}_{3}>\mathrm{BCl}_{3}$
(d)$\mathrm{BCl_3} > \mathrm{BMe_3} > \mathrm{BPh_3}$
Answer
Answer: A ✓ checked by 4AB · confidence medium
Explanation
BCl₃ is the strongest acid toward pyridine; BPh₃ (electron-withdrawing aryls) exceeds BMe₃ — BCl₃ > BPh₃ > BMe₃ (a).

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