Which transition in the hydrogen spectrum would have the same wavelength as the Balmer type transition from $$\mathrm{n=4}$$ to $$\mathrm{n}=2$$ of $$\mathrm{He}^{+}$$ spectrum

Adding surfactants in non polar solvent, the micelles structure will look like

$$\mathrm{H}_{2} \mathrm{O}_{2}$$ acts as a reducing agent in :

Which one of the following statements is correct for electrolysis of brine solution?