本题目来源于试卷: Models of Bonding & Structure B.2 The Covalent Model，类别为 IB化学
[单选题]
The tetrafluoroborate ion (${BF_4}^-$) is produced when boron trifluoride ($BF_3$) reacts with a fluoride ion.
A. In $BF_3$ is $sp^3$;In ${BF_4}^-$ is $sp^2$
B. In $BF_3$ is $sp^2$;In ${BF_4}^-$ is $sp^3$
C. In $BF_3$ is $sp^2$;In ${BF_4}^-$ is $sp^2$
D. In $BF_3$ is $sp^3$;In ${BF_4}^-$ is $sp^3$
参考答案: B
本题详细解析:
$BF_3$ is trigonal planar, with an unoccupied p orbital perpendicular to the plane of the molecule. The hybridization of B is $sp^2$.
${BF_4}^-$ is tetrahedral and the B atom has $sp^3$ hybridization.
This question is moderately difficult as the student must consider the hybridization of a non-hydrocarbon, recognizing that the B atom in $BF_3$ has only three electron domains and is therefore analogous to the C atom of ethene.
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