The ease of formation of the adduct, NH₃. BX₃ (where X=F, Cl, Br) follows the order · ABC26IN0466
Subject: Inorganic Chemistry · Chapter: Main Group Elements · Topic: Main Group Element – General · Exam: GATE 2005-2021 · Marks: 2 · Difficulty: Easy
The ease of formation of the adduct, $\mathrm{NH}_{3} . \mathrm{BX}_{3}$ (where $\mathrm{X}=\mathrm{F}, \mathrm{Cl}, \mathrm{Br}$ ) follows the order
(a)$\mathrm{BBr}_{3}<\mathrm{BCl}_{3}<\mathrm{BF}_{3}$
(b)$\mathrm{BCl}_{3}<\mathrm{BF}_{3}<\mathrm{BBr}_{3}$
(c)$\mathrm{BF}_{3}<\mathrm{BCl}_{3}<\mathrm{BBr}_{3}$
(d)$\mathrm{BBr}_{3}<\mathrm{BF}_{3}<\mathrm{BCl}_{3}$
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
Lewis acidity (and adduct formation) increases BF₃ < BCl₃ < BBr₃ (c).
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