Which of the following chemical system is non aromatic? (NEET 2013) (a) (b) (c) (d)

The molecules which do not satisfy Huckel rule or (4n + 2)π- electron rule are said to be non-aromatic. The compound (d) has total 4πe–. It does not follow (4n + 2)π rule. So, it is non-aromatic compound