Question

Use resonance structures to predict which sites on the following molecules would react with an electron acceptor. Enter your answer in increasing order separated by commas (ex. 1, 2, 3). o ch

Answer 1

Resonance effect: The delocalization of pi-electrons in a molecule, is called as the resonance effect. The resonance effect contributes in the stability of compound. Due to the movement of the pi-electrons from the one atom to another atom, results in the formation of more than one Lewis structure of the compounds, but none of them can individually explains the stability of overall compound. Hence, a resonance hybrid is formed by the combination of all resonating form of compound, which explains the overall stability of that compound. The resonance structure of the given organic molecule and attacking position of an electrophiles are as, follows: (a). The nitrogen contains one lone pair therefore it can accept electron deficient species, as follows: (b). The carbanion has one lone pair which make the structure electron rich and nitrogen also contains one lone pair therefore it can accept electron deficient species, as follows: 6,71 (c). Due to presence of lone pairs on oxygen atom the structure show conjugation and make the other two positions electron rich therefore it can accept electron deficient species, as follows: +7 +7 ОН OH 15 OH 2,6, 7 (d). The carbanion has one lone pair which make the structure electron rich and due to presence conjugation, it makes the other two positions electron rich therefore it can accept electron deficient species, as follows:

6:0: 7:0: 6:0: 7:0: 6:0: 7:0: tal- 3,6,7 (e). The carbanion has one lone pair which make the structure electron rich and due to presence conjugation, it makes the one another positions electron rich therefore it can accept electron deficient species, as follows: 4, 5 (f). All the electron donating groups are ortho-para directing, and meta deactivating group, due to these types of substituents electron density is increases on the ortho and the para position of the benzene ring. Therefore, the electron density increases due to the electron donating substituent on benzene, which results in the activation of benzene ring from the ortho and the para position towards an electrophile, therefore it can accept electron deficient species, as follows: + CH3 + CH3 + CH3 L :O O 2, 4, 6,7