Hackle rule (4n+2)π electron is used to distinguish whether a compound is aromatic or non aromatic. The compound (4) has 4πe−and thus it does not follow (4n+2) rule 
is non aromatic.
NEET UG 2013 — Chemistry Organic Chemistry
2013mcqhard
Which of the following chemical system is non aromatic?
Official previous-year question
Held on 30 Apr 2013 · Verified 9 Jul 2026.
Options
- A
- B
- C
- D
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