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In which of the following, resonance will be possible?

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${CH}_{2} = CH - {CH}_{2} = O$

${CH}_{2} = CH - {CH}_{2} - CH = {CH}_{2}$

${CH}_{3} {COCH}_{3}$

${CH}_{2} = CH - {CH}_{2} - CHO$

answer is B.

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Detailed Solution

Resonance is the delocalization of electrons in a conjugated system.
Conjugated system is a system having alternative sigma and pi Bonds
In option (a), (c) and (d), there is no resonance as there are no alternate single and double bonds.

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