1) No. Resistors 3 and 4 are not in series. They are in parallel.
2) Yes. The resistors 1 and 2 are in series.
4) As resistors 3 and 4 are in parallel, same potential difference will be allowed through them. Hence the potential drop across resistor 3 is 8V
5) Total emf = V1 + V2 + V3 + V4 = 6V + 14V + 8V +8V= 36V