How do the fusion reactions in the sun compare to the fusion occurring in larger stars and supernovas?

In a smaller star such as the Sun the main process of fusion from Hydrogen to Helium is the proton-proton chain reaction. This is where two protons combine under the strong nuclear force to form a diproton.

The Helium 2 or diproton is very unstable and usually breaks down into two protons. Occasionally transforms into deuterium by the weak nuclear force.

Then a proton is added to form Helium 3.

Larger stars use the CNO fusion reactions. This creates Helium from Hydrogen by a fusion process converting Carbon to Nitrogen to Oxygen and back to carbon. There are several reactions.

In the case of supernova explosions, vast quantities of free neutrons are released when the core collapses. A process called neutron capture creates elements heavier than Iron. Many elements heavier athan Iron and up to Plutonium are created in this way.

Fusion reactions in the Sun involve hydrogen nuclei fusing into helium, primarily through the proton-proton chain. Larger stars undergo more complex fusion processes, including helium burning and production of heavier elements. Supernovas involve rapid and intense fusion, leading to the synthesis of even heavier elements, releasing immense energy.