Which species does not have delocalized electrons?

A.     \({\text{NO}}_3^ - \)

B.     \({\text{NO}}_2^ - \)

C.     \({{\text{O}}_{\text{3}}}\)

D.     \({{\text{C}}_{\text{3}}}{{\text{H}}_{\text{6}}}\)

D

One respondent mentioned the fact that there is some debate in the literature in relation to possible sigma delocalization in cyclopropane which is a valid comment and although 63.98% of candidates chose D. \({{\text{C}}_{\text{3}}}{{\text{H}}_{\text{6}}}\) as the correct answer, it is fair to state that a different example might have been selected where there is no evidence of delocalization.