## Question

###### Please show work for better understanding 13.9 Define coupling constant. The distance between different signals The...

Please show work for better understanding

13.9 Define coupling constant.

- The distance between different signals
- The distance between the peaks of a multiplet
- The distance between the signal and the reference
- The distance between the first signal and the

last signal

13.20 Where do N–H signals appear

- 1H NMR spectrum
- 13C NMR spectrum
- 1H and 13C NMR spectra
- 1H, 13C, and DEPT spectra

13.17 Give the use of Distortionless Enhanced Polarization Transfer (DEPT).

a) Gives correlations between an 1H NMR spectrum and a 13C NMR spectrum.

b) Gives correlations between two 13C NMR spectra.

c) Gives correlations between two 1H NMR spectra.

d) Identifies the carbons in a 13C NMR spectrum as C, CH, CH2, or CH3.

13.18 List the type of peak seen in the DEPT-135 spectrum for a methylene

- Positive peak
- Negative peak
- No peak
- Two peak

13.19 In the DEPT spectrum, identify the group with a positive peak in DEPT-90

and DEPT-135.

- Quaternary
- Methine
- Methylene
- Methyl

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