Corruption is an important obstacle to the development of this state and its institutions. According to Forbes, the country became a battleground for future profits from the planned investments in the oil industry and pipeline construction. Photo: Place de la Nation in N'Djamena - Chadian capital, which is home to over 9 million inhabitants. (Photo: escandio / flickr.com) .5. Chad - Republic of Central Africa - ranked fifth in the ranking of the most corrupt countries in the world.