JEE MainChemistryChemical Bonding and Molecular Structure
The correct increasing order of C - O bond lengths in CO , CO ₂ , and CO ₃²⁻ is :
Options
- ACO ₃²⁻ < CO ₂ < CO
- BCO < CO ₂ < CO ₃²⁻
- CCO < CO ₃²⁻ < CO ₂
- DCO ₂ < CO ₃²⁻ < CO
Correct answer
B. CO < CO ₂ < CO ₃²⁻
Step-by-step solution
Bond length is inversely proportional to bond order. In CO , the bond order is 3 ( C O ). In CO ₂ , the bond order is 2 ( O = C = O ). In CO ₃²⁻ , there is resonance among three equivalent structures. The bond order is Total number of bonds Number of resonating structures = 4 3 = 1.33 . Since the order of bond order is CO ₃²⁻ Answer: CO < CO ₂ < CO ₃²⁻