Aromatic Compounds :sample question
Both naphthalene and azulene have 10 pie electrons and are aromatic. Pentalene is apparently antiaromatic and is unstable even at -100 degrees C. Heptalene has been made but it adds bromine, it reacts with acids, and it is not planar. Is Huckle's rule applicable to these compounds? If so, explain their lack of aromaticity.