Answer : A compound is called an anti-aromatic compound if the molecule of a compound has 4 সং electrons ( where n = 1, 2, 3 ...... etc) and a sphere of continuous p orbital. So compounds that have 4 ( n = 1), 4 ( n = 2), 12 ( n = 3) etc. electrons present in the molecule present in the molecule behave as anti-aromatic compounds. Such as cyclobutine , cyclopropinyl anion.