They are displacement reactions to replace other compounds and have to be balanced, if these clues helps you to reply your questions by yourself.
would the bromine displace the iodine as its more reactive and produce sodium bromide + iodide and would there be no reaction as the iodine is less reactive than the chlorine
would the bromine displace the iodine as its more reactive and produce sodium bromide + iodide and would there be no reaction as the iodine is less reactive than the chlorine
The question is: which halogens attract the electrons more to make bounds? yes, as bromine has a higher attraction as iodine, bromine displaces iodine. The same reason prevents a displacement between iodine and the chlorine.