benzene is the molecule or ion that needs only two resonance structures to describe its bonding.
benzene is the molecule or ion that needs only two resonance structures to describe its bonding.
which molecule or ion needs only two resonance structures to describe its bonding?
benzene
Na
Na
in terms of the electronic nature of the molecule, aromaticity describes a conjugated system often made of alternating single and double bonds in a ring. this configuration allows for the electrons in the molecule’s pi system to be delocalized around the ring, increasing the molecule's stability. the molecule cannot be represented by one structure, but rather a resonance hybrid of different structures, such as with the two resonance structures of benzene. these molecules cannot be found in either one of these representations, with the longer single bonds in one location and the shorter double bond in another (see theory below). rather, the molecule exhibits bond lengths in between those of single and double bonds. this commonly seen model of aromatic rings, namely the idea that benzene was formed from a six-membered carbon ring with alternating single and double bonds (cyclohexatriene), was developed by august kekulé (see history section below). the model for benzene consists of two resonance forms, which corresponds to the double and single bonds superimposing to produce six one-and-a-half bonds. benzene is a more stable molecule than would be expected without accounting for charge delocalization.
cyclic compound