SYD-BCN - QR
SYD-IST - QR
For a *ONE* ticket you need to list all the separate flights- they count
SYD-DOH-BCN QR [could also do SYD-LHR QF/BA and LHR-BCN IB/BA]
SYD-DOH-IST QR
For the others you need to check the airline fly the route non stop (or with 1 flight number)
For *ONE* questions better ask in the dedicated OW *ONE* threads or a seperate new thread, Not this thread
https://www.flyertalk.com/forum/oneworld-411/