74. the reaction ->0+e" (for e, > 2m.c) cannot take place because it violates the conservation of (a) charge (b) parity (c) charge conjugation (d) lepton number

Answer Charge is conserved in given reaction since -1+1=0 both sides. Lepton no. is conserved since L=-1 for electron and L=-1 for Positron. also charge conjugation is conserved si...