Question

Assertion : The experimentally determined carbon to oxygen bond length in carbon dioxide is $115$ pm
Reason : The lengths of a normal carbon to oxygen double bond $(C=0)$ and carbon to oxygen triple bond $(C \equiv 0)$ are $121$ pm and $110$ pm respectively.

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (B)

In carbon dioxide, the carbon-oxygen bond lengths lie in between the values for $(C=0)$ and $(C \equiv O)$ bond lengths because carbon dioxide is a resonance hybrid of following structures :