객관식
Which of the following statements best describes the concept of resonance structures in organic molecules?
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1. A Review of General Chemistry
Resonance Structures
객관식
Which of the following statements best describes the relationship between resonance structures of a molecule or ion?
A
Resonance structures are different possible Lewis structures for a molecule or ion that differ only in the placement of electrons, not the arrangement of atoms.
B
Resonance structures represent different isomers of a molecule that have different connectivity of atoms.
C
Resonance structures are different molecules that can interconvert through rotation around single bonds.
D
Resonance structures are always equally stable and contribute equally to the resonance hybrid.
검증된 단계별 안내1
Understand that resonance structures are multiple Lewis structures that represent the same molecule or ion, differing only in the placement of electrons (such as pi electrons or lone pairs), while the positions of the atoms remain fixed.
Recognize that resonance structures are not different isomers; isomers differ in the connectivity of atoms, whereas resonance structures have the same connectivity but differ in electron distribution.
Note that resonance structures are not different molecules that interconvert by rotation around single bonds; such rotations do not create resonance structures but conformers.
Remember that resonance structures are hypothetical constructs used to describe delocalization of electrons; the actual molecule is a resonance hybrid, which is a weighted average of all resonance contributors.
Keep in mind that resonance contributors do not always contribute equally to the resonance hybrid; their stability affects their contribution, so they are not always equally stable or equally weighted.
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