Which best explains why nuclear reactions release more energy than chemical reactions?

the forces holding the nucleus together are much stronger than the forces binding electrons to atoms.
protons have a much higher mass and energy than either neutrons or electrons.
during a chemical reaction, some of the mass of the reactants is converted to energy.
in nuclear reactions, all neutrons are converted to energy.

Benzonitrile (c6h5cn) is reduced to two different products depending on the reducing agent used. treatment with lithium aluminum hydride followed by water forms k, which has a molecular ion in its mass spectrum at 107 and the following ir absorptions: 3373, 3290, 3062, 2920, and 1600 cm-1. treatment with a milder reducing agent forms l, which has a molecular ion in its mass spectrum at 106 and the following ir absorptions: 3086, 2850, 2820, 2736, 1703, and 1600 cm-1. l shows fragments in its mass spectrum at m/z = 105 and 77. propose structures for k and l and choose an explanation for how this could be concluded.