1.

bar(C)H_(2) - underset(underset(..)O":")underset(||)(C) - CH_(3) harr CH_(2) = CH_(2) underset(underset(..)":O:"^(-))underset(|)(C) - CH_(3)

Answer»

RESONATING structures
tautomers
geometrical isomers
optical isomers.

Solution :`bar(C)H_(2) - UNDERSET(underset(..)O":")underset(||)(C) - CH_(3) harr CH_(2) = CH_(2) underset(underset(..)":O:"^(-))underset(|)(C) - CH_(3)`
These structures INVOLVE only movement of electrons but not of atoms and hence are resonating structures .


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