In the reaction NH₃ + BF₃ ⇄ NH₃BF₃ the ammonia behaves as a:
A) Lewis acid
B) Lewis base
C) Brönsted acid
D) Brönsted base
E) Arrhenius base
IMAT 2024 · Question 39
Q39 - The concept of acid and base
Pinned
The correct answer is B) Lewis base.
NH₃ has a lone pair, and BF₃ has an empty orbital on boron. NH₃ gives its lone pair to boron, which makes it a Lewis base (an electron-pair donor).
No H⁺ or OH⁻ moves, so the Brønsted and Arrhenius definitions don't apply here.
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