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Edexcel A-Level Chemistry A2 15.20 Both Low and High Resolution Proton Nmr Spectroscopy to I Predict the Different Types of Proton Present in a Molecule Questions

Combine peak count, chemical shift, relative area and n+1 splitting evidence to assign proton environments, compare isomers and deduce a consistent structure.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
A2

Exam points

  • Predict the number of proton environments and relative peak areas from molecular symmetry and the number of equivalent hydrogens.
  • Assign chemical-shift ranges to proton environments by using the Data Booklet and nearby functional groups.
  • Apply the n+1 rule to explain singlet, doublet, triplet, quartet and higher splitting patterns from adjacent hydrogens.
  • Deduce and justify an organic structure by combining peak count, integration, chemical shifts and splitting patterns.

Edexcel A-Level Chemistry A2 15.20 Both Low and High Resolution Proton Nmr Spectroscopy to I Predict the Different Types of Proton Present in a Molecule Questions question 1

[Maximum number: 3]

This question is about carboxylic acids and their derivatives.

An organic compound E contains carbon, hydrogen and oxygen only.

Data from the high resolution proton NMR spectrum of E is shown.

Table for Question Edexcel A-Level Chemistry A2 15.20 Both Low and High Resolution Proton Nmr Spectroscopy to I Predict the Different Types of Proton Present in a Molecule Questions question 1 — Edexcel A-Level Chemistry A2

Deduce the structure of E.
Justify your answer by labelling the protons responsible for each peak.

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