Discussion
Consider the following statements about spectroscopy.
1. Absorbance is proportional to concentration 2. A vibration is infrared active only if the dipole moment changes 3. Chemical shift in parts per million depends on the instrument's field strength
Answer: B
Correct answer: 1 and 2 only are correct
Statements 1 and 2 are correct: absorbance is linear in concentration through Beer’s law, and a vibration absorbs in the infrared only if it changes the dipole moment. Statement 3 is precisely backwards - the chemical shift is expressed in parts per million so that it does not depend on the instrument’s field, which is what makes shift values transferable between spectrometers.
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