Edexcel A-Level: Modern Analytical Techniques

How many unique hydrogen environments are present?

• 2

• 3

• 4

• 5

How many unique carbon environments are present?

• 2

• 3

• 4

• 5

The peak in the high resolution proton NMR spectrum corresponding to the hydrogen in bold will be split into how many peaks?

• 1 (No splitting)

• 3

• 4

• 7

• A

• B

• C

• D

How many main peaks would you expect in the proton nuclear magnetic resonance spectrum of caffeine?

• 1

• 2

• 3

• 4

At which of the following wavenumbers is an absorption peak not present in the infrared spectrum of caffeine?

• 3600 cm^-1

• 2925 cm^-1

• 1690 cm^-1

• 1660 cm^-1

The molecular ion peak in a mass spectrum would have a mass/charge ratio of:

• 101

• 102

• 193

• 194

The intermolecular forces present between caffeine molecules are:

• London forces only.

• London forces and hydrogen bonds.

• London forces and permanent dipole forces.

• London forces, permanent dipole forces, and hydrogen bonds.

• 8

• 7

• 4

• 3

• A

• B

• C

• D