Which of the Following Is Not True Regarding ¹H NMR $\sigma$

question 43

Multiple Choice

Which of the following is not true regarding ¹H NMR spectroscopy?

• A)"shielding" leads to peaks at lower values of \(\sigma\)
• B)a "downfield" peak appears at a higher value of \(\sigma\)
• C)" \(\sigma\) for a particular proton depends on the magnetic field strength of the instrument used."
• D)on a 300 MHz instrument, a proton that adsorbs irradiation at a frequency 1200 Hz higher than the adsorption of TMS appears at \(\sigma\) 4 ppm.

---

Definitions:

Allergy

An immune system reaction to certain substances, resulting in symptoms like sneezing, itching, and difficulty breathing.

Itchy Eyes

A discomforting sensation around the eyes prompting a desire to rub, often caused by allergies, eye strain, or infections.

Common Cold

A viral respiratory infection causing symptoms like runny nose, sore throat, cough, and sneezing.

Influenza

A highly contagious viral infection of the respiratory passages causing fever, severe aching, and often occurring in epidemics.