Question

state huckle rule..............

Answer 1

1=the molecule must have 4n + 2 electrons in p orbitals (on sp2 or sp hybridized carbon or heteroatoms)
2=the molecule must be (close to) planar (porbitals must be roughly parallel and able to interact)
3=the molecule must be cyclic (as opposed to linear)
4=the molecule must have a continuous ring of p orbitals (p orbitals cannot be interrupted by sp3 atoms or be exocyclic to the main ring of orbitals).