Indicate whether the following physical characteristics of a

Indicate whether the following physical characteristics of a ¹H-NMR or IR spectrum are increasing or decreasing in the direction of the arrow shown below. Place you answer in each of the textboxes provided.Partial positive charge on a proton’s respective carbon in ¹H-NMR?

Degree of deshielding of a proton in ¹H-NMR?

Wavelength needed to affect a bond in IR?

Energy of IR needed to affect a bond in IR spectroscopy?

Answer A\" for Increasing ecreasing8 10 ppm OR 4000 wavenumbers (cm ) 0 ppm OR 0 wavenumbers (cm) Increasing or Decreasing?

Solution

ans deshielding increases

Deshielding:
If the electron density around a nucleus decreases, the proton experiences high external magnetic field, and therefore, the chemical shift shifts downfield (higher ppms) .

ans wavelength will decrease

The wave number is inversely proportional to the wavelength .

ans energy will increase

The wave number is directly proportional to Energy

ans shielding decreases

Shielding:
If there is high electron density around the nucleus, the proton experiences lower external magnetic field, and therefore, the chemical shift shifts upfield (lower ppms) .