1. A certain proton NMR spectrum (recorded on a 400 MHz NMR spectrometer) consists of one...

1. A certain proton NMR spectrum (recorded on a 400 MHz NMR spectrometer) consists of one singlet and one doublet. The singlet has a chemical shift of 5.0 ppm. The doublet is 2600 Hz upfield from the singlet. Which one of the following statements is correct?

A) The chemical shift of the doublet (on the delta scale) is positive

B) The chemical shift of the doublet (on the delta scale) is negative

2. Which one of the following statements is correct?

A) The electromagnetic radiation used in IR spectroscopy is higher in energy than that used in X-ray crystallography

B) The electromagnetic radiation used in IR spectroscopy is lower in energy than that used in X-ray crystallography

Solutions

Expert Solution

1) The chemical shift of singlet in ppm is 5.0ppm is on the left side (i.e. downfield) from reference signal (i.e. 0 ppm).

2) Infrared radiation has a longer wavelength than the X-rays. Hence the answer is the option: B) The electromagnetic radiation used in IR spectroscopy is lower in energy than that used in X-ray crystallography.

queen_honey_blossom answered 9 months ago

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