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Per NCERT §4.3.5, the concept of RESONANCE is invoked when which condition holds?
AWhen bond order is 0
BWhen a single Lewis structure cannot describe a molecule accurately — multiple canonical forms give a resonance hybrid
CWhen atoms are isoelectronic
DWhen the molecule is gaseous
Answer & Solution
Correct answer: B. When a single Lewis structure cannot describe a molecule accurately — multiple canonical forms give a resonance hybrid
Per NCERT §4.3.5, when one Lewis structure mismatches experiment (e.g. O₃ bond lengths all equal 128 pm), use resonance hybrid of canonical forms.
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