Is the cyclopentadienyl anion aromatic?

Which is not aromatic 1) teopyliumcation 2) chrysene 3) cyclopentadienyl 4) cyclopropenyl

There are Choose your answer here resonance structures that can be drawn for the cyclopentadienyl cation.

which of the following is not aromatic

Is [16]annulene aromatic?

Conjugated monocyclic hydrocarbons such as benzene and cyclooctatetraene are known as annulenes. They have the general formula CnHn. The IUPAC naming conventions are that annulenes with 8 or more carbon atoms are named as [n]annulene, where n is the number of carbon atoms in the ring. Very large rings with up to 30 carbon atoms are known.Count the number of π electrons in [18]annulene, shown below, and use the rule you have deduce to predict whether the ring is aromatic. You can check your answer by examining the structure.Is [18]annulene aromatic?Open datebase entry for [18]annuleneGroup of answer choicesYes, the ring is likely to be aromaticNo, the ring is unlikely to be aromatic