Question:
Identify the pair containing only Lewis acids.
Identify the pair containing only Lewis acids.
Show Hint
Lewis acids accept electron pairs, while Lewis bases donate electron pairs. \(H^+\) and \(BF_3\) are common Lewis acids.
Updated On: May 7, 2026
- \(BF_3,\ NH_3\)
- \(H^+,\ BF_3\)
- \(F^-,\ H_2O\)
- \(NH_4^+,\ NH_3\)
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The Correct Option is B
Solution and Explanation
A Lewis acid is a species which can accept a pair of electrons.
A Lewis base is a species which can donate a pair of electrons.
Now check the options carefully.
The species \(BF_3\) is electron deficient because boron has only six electrons around it after bond formation.
So,
\[
BF_3
\]
can accept an electron pair.
Therefore,
\[
BF_3
\]
is a Lewis acid.
Now consider:
\[
H^+.
\]
The hydrogen ion has no electron and can accept an electron pair from a donor species.
Therefore,
\[
H^+
\]
is also a Lewis acid.
So the pair
\[
H^+,\ BF_3
\]
contains only Lewis acids.
On the other hand,
\[
NH_3
\]
has a lone pair on nitrogen and donates this lone pair.
Therefore,
\[
NH_3
\]
is a Lewis base, not a Lewis acid.
Hence, the correct pair containing only Lewis acids is:
\[
H^+,\ BF_3.
\]
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