Which of the Following Is Not True Regarding ¹H NMR

question 35

Multiple Choice

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

• A) "shielding" leads to peaks at lower values of d
• B) a "downfield" peak appears at a higher value of d
• C) d 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 d 4 ppm.

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Definitions:

Predictor Variables

Variables in statistical models that are used to predict or estimate the value of another variable, known as the response variable.

Regression Analysis

A statistical method for modeling the relationship between a dependent variable and one or more independent variables.

Response Variables

Variables that measure the outcome of a study or experiment, showing the effect of manipulations in predictor variables.

Multicollinearity

A situation where two or more independent variables in a multiple regression model show a high degree of correlation.