Which of the following transitions have minimum wavelength

Which of the following transitions will have minimum wavelength ?

Which of the following transitions will have minimum wavelength ?

Which of the following transitions will have minimum wavelength ?

Which of the follawing transition will have minimum wavelength? n_4 rarr n_1 , n_2 rarr n_1 , n_4 rarr n_2 , n_3 rarr n_1

Which of the following transition will have a wavelength different than that observed in rest of the transition ?

Which of the following transition will have a wavelength different than that observed in rest of the transitions ?

In which of the following transitions will the wavelength be minimum ?