Question

Why we observe 7.26 ppm peak in proton nmr spectrum?

Answer 1

Most NMR spectra are recorded for compounds dissolved in a solvent. Therefore, signals will be observed for the solvent and this must be accounted for in solving spectral problems. In chloroform solvent (CDCl3), this corresponds to CHCl3, so a singlet signal is observed at 7.26 ppm.

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Answer 2

hey

To avoid spectra dominated by the solvent signal, most 1H NMR spectra are recorded in a deuterated solvent. However, deuteration is not "100%", so signals for the residual protons are observed. In chloroform solvent (CDCl3), this corresponds to CHCl3, so a singlet signal is observed at 7.26 ppm.