A = Has 8π electrons, does not follow Huckel rule. Orbitals of one carbon atom are not in conjugation. It is not aromatic.
B = Has 6π delocalised electrons. Hence, is aromatic.
C = Has 6π electrons in conjugation but not in the ring. Non aromatic.
D = 10π electrons in planar rings, aromatic.
E = Out of 8π electrons it has delocalised 6π electrons in one six membered planar ring, which follows Huckel’s rule due to which it will be aromatic.
F = 14 π electrons are in conjugation and are present in a ring. Huckel’s rule is being followed. Compound will be aromatic if ring is planar.
