Here you can find answers to previously asked similar questions:
/u/ErikLehnsherrr in Was there any discussion / consideration within Thatcher's government (or other UK governments) to handover Hong Kong to Republic of China (Taiwan), instead of PRC?
/u/Lipno in Why were Hong Kong given to People's Republic of China (PRC), but not Republic Of China (ROC)?
/u/kielser in When Britain handed Hong Kong over to the PRC, did they consider handing it to ROC instead?