Question

How can I determine `""^13 "C NMR"` signals?

Answer 1

Run the `""^13C{""^1H}` `"NMR spectrum"` first.............

Explanation:

And see this older answer. Symmetry is the key to rationalizing all spectroscopy. When we consider an organic molecule for its likely `""^1H` or `""^13C{""^1H}` `"NMR spectrum"` it is useful to assume the maximum symmetry possible.