Apentix/AP Chemistry/Unit 2: Molecular and Ionic Compound Structure and Properties/Question
AP Chemistrymediummcq1 pt

Which statement correctly describes the three C-O bonds in the carbonate ion, CO₃²⁻?

A.All three are equivalent, with lengths between those of single and double bonds
B.Two are single and one is double, fixed permanently in place
C.All three are identical double bonds
D.Their lengths alternate because electrons stay localized on individual oxygens

Explanation

Core Concept

Three equally valid resonance structures place the double bond on a different oxygen each time. The real ion is the average of these forms, so every C-O bond has an identical bond order of about 1.33. Experiments confirm one uniform bond length, shorter than a normal single bond yet longer than a true double bond.

Correct Answer

AAll three are equivalent, with lengths between those of single and double bonds

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