Geography Circuit

(This got delayed; apologies.) Today’s questions are on Central Africa!

1. What aptly named country north of the Democratic Republic of the Congo has its capital at Bangui?
2. What island country, one of the smallest in Africa, can be found west of Port Gentil?
3. The Congo River has its mouth near what Angolan exclave?
4. Oyala is a city currently being built to replace what capital city on Bioko Island?
5. Lubumbashi is the largest city in what region in the southeastern Democratic Republic of the Congo, known for its abundant resources?