Hi i would really appreciate it if someone could help me with this. Exercises fo

Question

Hi i would really appreciate it if someone could help me with this.

Exercises for Part B 4. Complete the sentence: In coupled C NMR, the number of peaks in a peak cluster s. Complete the sentence: In "c NMR, the location of the peak cluster along the x 6. Complete the sentence: InCNMR, the number of different peak clusters tells ("multiplicity of the peak cluster") tells you.. axis (ppm value) tells you.. you... 7. Complete the sentence: In TC NMR, the height of a peak tells you... 8. Chemists rarely use proton coupled C NMR spectra Explain why. 9. Tor F: In decoupled"c NMR each peak cluster is reduced to a singlet (a single peak) 10. The decoupled c NMR spectrum of a molecule with the molecular formula CsH12 propose a structure for this is shown below. On the basis of this spectrum, molecule.

Explanation / Answer

4. In 13C NMR the numbers of peak in a peak cluster tells you how many hydrogen atoms are attached to a carbon atom.

Number of peaks in a cluster= number of hydrogen atom attached to carbon+1

5. In 13C NMR the location of peak clusters along the x-axis tells you about the density of electron cloud around that carbon atom.

6. In 13C NMR number of different peak clusters tells you about the carbon atoms with different environment or set of equivalent carbon atom present in the molecule.

7. In 13C NMR height of a peak tells you about the intensity, and what is the degree of the carbon atom either it is 1º, 2º, 3º, 4º. Actually it is very difficult to interpret the peak height in 13C NMR.

8. Chemist rarely used proton coupled 13C NMR as coupling occurs but at very low rate due to low natural abundance of 13C.

9. It is true that in decoupled 13C NMR each peak cluster is reduced to a singlet.

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