Which of the given structures are valid resonance contributors of protonated methyl vinyl ketone? (i) (ii) (iii)

Step-by-step solution

The given structure is protonated methyl vinyl ketone, CH₂=CH-C(= + O H)-CH₃ . Resonance structures are formed by the delocalization of electrons without altering the position of any atoms. Shifting the electrons of the C=O bond to the positively charged oxygen atom neutralizes the oxygen and places a positive charge on the adjacent carbon atom. This results in structure (i): CH₂=CH- + C (OH)-CH₃ . Further delocalization of the electrons from the C=C double bond towards the positively charged carbon shifts the doub