The answer to this question is a tricky one, because it depends on what you are trying to learn. If you’re looking for the differences between resonance and tautomers, then we would have to say that resonance is more important. Tautomers do not play a role in covalent bonding.
However, if you were trying to determine which is easier for students to understand, then we would have to say that both are equally challenging. This is because it can take a long time to finally understand what resonance and tautomers are. If you’re looking for the differences between resonance and tautomers, then we would have but understanding them may be difficult at first because they may not make sense initially
To help clarity this, let’s go over the definition of each and see how they are different. Tautomers refer to two or more structures that have a specific molecular formula but possess different bonding patterns due to differing arrangements of electrons in their atoms. Resonance is when an electron distribution has multiple possible states for one molecule with a common chemical composition.
It is important to note that resonance can be helpful because it simplifies some aspects, while also adding complexity. For example, some students may find resonance easier than Tautomsers because there is only one equation instead of several equations needed! That said, both are equally as complicated because you need time and patience if you want to grasp what they’re talking about.