Explain why each of the following structure is not a resonance form? (a) :overset(..)(O)= overset(..)(O): and underset(.):overset(..)(O)= underset(.)overset(..)(O): (b) CH_(3) - underset(underset(OH)(|))(C )=CH_(2) and CH_(3) - underset(underset(O)(||))(C )-CH_(3)

Explain why each of the following structure is not a resonance form?

1.	Explain why each of the following structure is not a resonance form? (a) :overset(..)(O)= overset(..)(O): and underset(.):overset(..)(O)= underset(.)overset(..)(O): (b) CH_(3) - underset(underset(OH)(\|))(C )=CH_(2) and CH_(3) - underset(underset(O)(\|\|))(C )-CH_(3)
Answer» SOLUTION :(a) Contributing structures must have the same number of paired ELECTRONS. SINGLET and triplet states can not be contributing structures. (b) These isomers differ in the PLACEMENT of the H atom, in this special case they are called TAUTOMERS.