Which one of the following pairs of structures represent the phenomenon of resonance?

Options

A. `H_(2)C=CH-overset(overset(O)(||))(C)-H, Coverset(+)(H_(2))-CH=overset(overset(O^(-))(|))(C)-H`
B. `CH_(2)=CH-overset(+)(CH)Cl," "overset(+)(CH_(2))-CH=CH-Cl`
C. `(CH_(3))_(2)CH-overset(overset(O)(||))(C)-O^(-),(CH_(3))_(2)CH-overset(overset(O^(-))(|))(C)=O`
D. `CH_(3)-CH_(2)-overset(overset(O)(||))(C)-CH_(3), CH_(3)-CH=overset(overset(O^(-))(|))(C)-CH_(3)`

Answer

A, B, C

Explanation

A) `H_2C = CH- overset(O)overset(||)C-H , Coverset(+)H_2 - CH= overset(O^(-))overset(|)C-H`
B) `CH_2 = CH - overset(+)(CH)Cl , overset(+)(CH_2) - CH = CH - Cl`
C) `(CH_3)_2 CH - overset(O)overset(||)C-O^(-) , (CH_3)_2CH- overset(O^(-))overset(|)C=O`