The correct sequence for the generation of solar energy is given as option 4: 1-3-2.

Option 1 explains that hydrogen is converted to helium at very high temperatures and pressures. This refers to the process of nuclear fusion that takes place in the core of the sun.

Option 3 states that a vast quantity of energy is generated by nuclear fusion. This is a result of the fusion reactions occurring in the core, where hydrogen nuclei combine to form helium and release a tremendous amount of energy in the process.

Finally, option 2 mentions that the energy finds its way to the sun`s surface. This refers to the process of energy transfer through convection and radiation, where the energy generated in the core gradually moves towards the sun`s surface and is eventually emitted as electromagnetic radiation.

Therefore, the correct sequence for the generation of solar energy is 1-3-2, as mentioned in option 4.