Question Detail
Question
Which of the following is aromatic?
Correct Answer
Option D is the correct answer.
Detailed Explanation
Cycloheptatrienyl cation (tropylium ion) is aromatic with 6 π electrons (4n+2, n=1), planar, and cyclic conjugated system. Cyclopentadienyl cation has 4 π electrons (anti-aromatic), 1,3-cyclohexadiene is not fully conjugated, and cyclobutenyl anion has 4 π electrons.
Hint
Which ion has 6 π electrons in a cyclic conjugated system?