(1) The process cannot occur as there are 2 more leptons (e-,ve) on the right comopared to zero on the left
(2 ) The process is forbidden because this corresponds to a change of lepton number by, (0 on the left - 1 on the right)
(3) The process is forbidden because μ-, vμ being both leptons ΔL = 2hre.
(4) , (5), (6) are allowed (except that one must distinguish between muon neutrinoes and electron neutrinoes). The correct names would be