Please state the balanced reaction equation between sodium bromide (NaBr) and chlorine gas (Cl2). Why does this reaction happen but not if the chlorine is replaced with Iodine (I2)?

2NaBr + Cl2 --------- 2 NaCl + Br2Chlorine is more reactive than bromine so can displace it from the molecule. Iodine is less reactive than bromine so cannot displace it from the molecule.