The Lewis acid character of BF₃, BCl₃ and BBr₃ follows the order · ABC26IN0440
Subject: Inorganic Chemistry · Chapter: Main Group Elements · Topic: Main Group Element – General · Exam: GATE 2005-2021 · Marks: 2 · Difficulty: Easy
The Lewis acid character of $\mathrm{BF}_{3}, \mathrm{BCl}_{3}$ and $\mathrm{BBr}_{3}$ follows the order
(a)$\mathrm{BF}_{3}<\mathrm{BBr}_{3}<\mathrm{BCl}_{3}$
(b)$\mathrm{BCl}_{3}<\mathrm{BBr}_{3}<\mathrm{BF}_{3}$
(c)$\mathrm{BF}_{3}<\mathrm{BCl}_{3}<\mathrm{BBr}_{3}$
(d)$\mathrm{BBr}_{3}<\mathrm{BCl}_{3}<\mathrm{BF}_{3}$
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
B–X π back-donation is strongest for F, so acidity BF₃ < BCl₃ < BBr₃ (c).
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