`:CH_(2)-underset(underset(..)(O: ))underset(||)(C )-CH_(3)` and `H_(2)C=underset(underset(..)( :O: ))underset("|")("C")-CH_(3)` are :

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`:CH_(2)-underset(underset(..)(O: ))underset(||)(C )-CH_(3)` and `H_(2) ... structures B. tautomers C. geometrical isomers D. optical isomers

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