The links in green are activated while those in red will be activated soon. Here are all the links:-

Ch1 - Introduction
Ch2 - Early Life
Ch3 - Education
Ch4 - Contribution to Chemical research
Ch5 - Passionate and Innovative Teacher
Ch6 - Establishment of Indian Chemical Society
Ch7 - Revolutionary Scientist of Independence Movement
Ch8 - Visionary Startup Industrialist
Ch9 - Humble Philanthropist
Ch10 - The Book that taught Ancient Indian Chemistry to the World, "The History of Hindu Chemistry"
Ch11 - What Others said about P.C.Ray