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QLDChemistryQuick questions
Unit 4: Structure, synthesis and design
Quick questions on Proton (1H) NMR spectroscopy (QCE Chemistry Unit 4)
6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is the molecular mass?Show answer
| MS (M+) | | Are these functional groups present? | IR (O-H, C=O, N-H) | | How many hydrogen environments? Where?
What are counting hydrogen environments?Show answer
Two hydrogens are in the same environment if they are equivalent by symmetry (interchangeable by a molecular symmetry operation or by free rotation of an attached methyl group). They give a single combined signal.
What is chemical shift?Show answer
Each environment has a characteristic chemical shift range, determined by the inductive effects of attached groups. The QCAA syllabus uses the following reference ranges (the QCAA data booklet table for Unit 4 spectroscopy):
What is q1?Show answer
Predict the number of NMR environments in (a) ethanol , (b) propan-2-ol. [2 marks]
What is q2?Show answer
Predict the multiplicity (splitting) of each peak in propanal and give expected integration ratio. [4 marks]
What is q3?Show answer
An unknown shows two singlets in NMR at (6 H) and (broad, 2 H). (a) Suggest a structure. (b) Identify the OH peak.
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