Assertion : Carbon-oxygen bonds are of equal length in carbonate ion.
Reason : Bond length decreases with the multiplicity of bond between two atoms.

Options

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

Answer

B

Explanation

`CO_(3)^(2-)` shows resonance and thus all the three bonds are of indentical bond length.
`O=underset(O_(-))underset(|)(C)-O^(-)harrO^(-)-underset(O_(-))underset(|)(C)=O harrO^(-) - underset(O)underset(||)(C)-O^(-)`