The correct order of Lewis acid strengths of BF₂ Cl, BFClFBr, BF₂ Br and BFBr₂ is: · ABC26IN0478
Subject: Inorganic Chemistry · Chapter: Main Group Elements · Topic: Main Group Element – General · Exam: GATE 2005-2021 · Marks: 2 · Difficulty: Hard
The correct order of Lewis acid strengths of $\mathrm{BF}_{2} \mathrm{Cl}, \mathrm{BFClFBr}, \mathrm{BF}_{2} \mathrm{Br}$ and $\mathrm{BFBr}_{2}$ is:
(a)$\mathrm{BFBr}_{2}>\mathrm{BFClBr}>\mathrm{BF}_{2} \mathrm{Br}>\mathrm{BF}_{2} \mathrm{Cl}$
(b)$\mathrm{BFClBr}>\mathrm{BFBr}_{2}>\mathrm{BF}_{2} \mathrm{Cl}>\mathrm{BF}_{2} \mathrm{Br}$
(c)$\mathrm{BF}_{2} \mathrm{Cl}>\mathrm{BFClBr}>\mathrm{BF}_{2} \mathrm{Br}>\mathrm{BFBr}_{2}$
(d)$\mathrm{BF}_{2} \mathrm{Cl}>\mathrm{BF}_{2} \mathrm{Br}>\mathrm{BFClBr}>\mathrm{BFBr}_{2}$
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
Acidity rises as B–X π donation weakens (Br < Cl < F): BFBr₂ > BFClBr > BF₂Br > BF₂Cl (a).
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