What half reaction occurs at the anode during the electrolysis of molten sodium bromide?

Question

1. Na+ + 1e- ----> Na

2. 2H2O + 2e- ---> 2OH- + H2

3. Br2 + 2e- ---> 2Br-

4. Na ---> Na+ + 1e-

5. 2Br- ---> Br2 + 2e-

Answer 1

5.

Answer 2

3.