# When you have a doublet of doublets how many neighbouring hydrogen will there be?

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Hint:. The answer is based on the concept of nuclear magnetic resonance spectra or NMR spectra which is used to observe the local magnetic fields around the nuclei and gives the information about how many neighbouring hydrogen exists for particular hydrogen or group of equivalent hydrogens.

- NMR spectra basically tells us about the structure of the atom. There are several types of NMR like proton NMR,$^{13}C$- NMR and some other.