Identify compound from its molecular formula and its 1H NMR spectrum: C,H12122715432.1108.68 (ppm)frequency

First, calculate double bond equivalent of C9H12. It is given as: DBE = C + 1 - H2 - X2 + N2= 9 + 1…

Answered: C,H12 12 27 15 4 3 2. 1 10 8. 6 8 (ppm)…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

Identify compound from its molecular formula and its¹H NMR spectrum:

C,H12
12
27
15
4
3
2.
1
10
8.
6
8 (ppm)
frequency

Expert Solution

Step 1

First, calculate double bond equivalent of C₉H₁₂. It is given as:

$\begin{array}{rcl} D B E & = & C + 1 - \frac{H}{2} - \frac{X}{2} + \frac{N}{2} \\ = & 9 + 1 - \frac{12}{2} \\ = & 4 \end{array}$

This indicates that the compound may contain an aromatic ring.

Step 2

The number of peaks in an NMR spectra is equal to the number of equivalent protons/set of equivalent protons in the structure. The splitting of an NMR signal is according to the N+1 rule, where N is the number of neighboring protons. The chemical shift is according to the shielding/deshielding nature of protons in the magnetic field.

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