A) \[C{{H}_{2}}=CH-C{{H}_{2}}-CHO\]
B) \[C{{H}_{2}}=CH-CHO\]
C) \[C{{H}_{3}}COC{{H}_{3}}\]
D) \[C{{H}_{2}}=CH-C{{H}_{2}}-CH=C{{H}_{2}}\]
Correct Answer: B
Solution :
: Resonance occurs only in conjugated systems. ie. \[C{{H}_{2}}=CH-CH=O.\]
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