Models of Bonding & Structure B.2 The Covalent Model (id: c260c3bbf)

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]
Ethene has the following structural formula:


Which orbitals of the carbon atoms are used to form the C-H and C=C bonds of ethene?

A. $sp^2$ orbitals used to form C-H；$p$ orbitals used to form C=C
B. $p$ orbitals used to form C-H；$sp^2$ and $p$ orbitals used to form C=C
C. $sp^2$ orbitals used to form C-H；$sp^2$ and $p$ orbitals used to form C=C
D. $p$ orbitals used to form C-H；$sp^2$ orbitals used to form C=C


参考答案:  C


本题详细解析:
The $sp^2$ orbitals in ethene are used to form $�$ bonds, while the non-hybridized p orbitals overlap laterally to form the $�-��$ bonds.
The $�=�$ bond contains one $�$ and one $�$ bond, so it involves both $sp^2$ and p orbitals.
This question is moderately difficult as the student must recognize the difference between $sp^2$ and p orbitals and understand how they contribute to both $�$ and $�$ bonds without the aid of orbital diagrams.

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