2 Answers
156Single bonds are longer than double bonds.
In case of the anion form of the acid, it is resonance stabilized, hence, the γ & δ bond lengths will be the same. (They have 1.5 bond order, and greater the bond order smaller is the bond length).
And α is a pure double bond, while β is a pure single bond.
Hence, the bond length order shall be:
B.L of β > γ = δ > α
106yeah rajiv's answer is correct
@abhi: in fig II the two reso str. are equivalent. So, the two bond lengths are equal
