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Question:

Which of the following molecules is least resonance stabilized?

Solution:

The molecule in the option (C) is least resonance stabilised. This is because, the three C=C double bonds are not part of a benzene ring (i.e., they do not form an alternate single and double bond system in a ring system). All the carbon atoms are not sp2 hybridised. Hence, this molecule is not aromatic. All the remaining molecules are aromatic which leads to delocalisation and obeys Huckel's rule.