MChem Master of Chemistry Study Guide 2026
Everything you need to pass the MChem Master of Chemistry exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 MChem Master of Chemistry Exam Format at a Glance
📚 MChem Master of Chemistry Topics to Study (45)
✍️ Sample MChem Master of Chemistry Questions & Answers
1. Spectrogram produced by spectroscopic measurements is the outcome of the
In absorption spectroscopy, a spectrogram (or spectrum) is generated by measuring the amount of light absorbed by a sample across different wavelengths. The resulting graph shows peaks and troughs that correspond to specific wavelengths of radiation that are absorbed by the sample's molecules, providing unique information about its chemical composition and structure.
2. For a chain reaction mechanism, the steady-state approximation applied to radical intermediates gives the rate law. Which step determines the overall reaction order for a long chain?
In a long chain where the chain length >> 1, propagation steps dominate and determine the observed rate law and reaction order.
3. Which of the following processes employs lead tetraacetate to dissolve a glycol's carbon-carbon bond?
The Criegee oxidation is a specific organic reaction that employs lead tetraacetate (Pb(OAc)4) to selectively cleave the carbon-carbon bond of vicinal diols (glycols). This oxidative cleavage typically results in the formation of aldehydes or ketones. It is a valuable method in organic synthesis for breaking C-C bonds in a controlled manner.
4. In the Wacker process, ethylene is oxidized to acetaldehyde using what catalytic system?
The Wacker process uses PdCl2 as the stoichiometric oxidant, regenerated by CuCl2, which is re-oxidized by O2 from air.
5. In NMR spectroscopy, which concept explains why axial and equatorial protons in cyclohexane have different chemical shifts?
Axial and equatorial protons are diastereotopic—they cannot be interconverted by any symmetry operation—so they appear at different chemical shifts in the NMR spectrum.
6. How does the Wittig reaction construct a carbon–carbon double bond?
The phosphorus ylide reacts with the carbonyl to form a four-membered oxaphosphetane ring, which undergoes retrocycloaddition to give the alkene and triphenylphosphine oxide.