Which of the following molecules is least resonance stabilized?

Which of the following molecules is least resonance stabilized?

Solution

In A,B,D entire ring involved in delocalisation and follow huckel rule of (4n+2)pi electrons. so, they are aromatic and are more stable.
While in C one carbon is sp3 so non planar. so, non aromatic and it is less stable.
 

Asked in: JEE Main 2017 (02 Apr)

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