Under Studies in Conducting Polymers, the chemistry of chemical doping in conjugated polymers has been studied. An evidence for disruption in pconjugation upon increase in doping was established through various photo-physical, electrical and morphological investigations. The dielectric constant ε′(ω), dielectric loss ε′′(ω)and ac conductivity σ(ω)m of lightly doped poly (3-hexylthiophene) (P3HT) films give the evidence that, both dc conductivity as well as dielectric relaxation originate from the same hopping process. These findings give in-depth understanding of conjugated polymers for application in organic electronics.