D) 1,3,5 heptatriene
Correct Answer: D
Solution :A compound is said to be aromatic if it is planar and there is complete delocalization of \[\pi \] electrons, which is only possilble if it is a conjugated cyclic system and number of electrons used in delocalization is \[(4n+2)\]. 1, 3, 5 heptatriene is not an aromatic compound because complete delocalization of \[\pi \] electrons, is not possible in it.
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