RGSHW Year 13 Chemistry - self assessment instrumental analysis - Phoenix Hoyle | Library

1

Annotate the peaks on the show your work section.
Identify the finger print region.

1

Write the fragmentation equations for each of the peaks above.
Upload your answer to the show your work section.

4

What can be deduced about the structures of X and Y using all this information and the data booklet? Justify your answer. (4 marks)

8

Use the NMR spectra and your answer to (a) to deduce the structural formulae of X and Y. Justify your answer and explain why both NMR spectra are consistent with these structures. (6 marks)

1

An organic compound X is an ester found in orange peel and has the molecular formula C5H10O3. Identify the bonds responsible for the peaks labelled Q and R in the infrared spectrum of X shown below, referring to your data booklet.

2

X was heated under reflux with dilute sulfuric acid. The resulting mixture was distilled, and a liquid Y was collected. The mass spectrum of Y is shown below. (i) Identify Y, by name or formula, using the information available. Use two pieces of data from the mass spectrum to support your answer.

2

The identity of Y could be confirmed using NMR spectroscopy. Predict the number of peaks in the low resolution proton NMR spectrum of Y. Give the chemical shift range for each peak, referring to your data booklet.

1

A second product from the reaction of X with hydrochloric acid is Z, which has the molecular formula C₄H₈O₃. What can you deduce about Z from the results of the following tests?

1

Use the results of these tests to deduce the structural formula of Z and hence the structural formula of X.

1

The structure of methyl propanoate can be investigated using high resolution ¹H nuclear magnetic resonance (NMR) spectroscopy. 

(i) What type of radiation interacts with ¹H nuclei in NMR spectroscopy? (1 mark)

_______ waves.

1

Describe what happens to ¹H nuclei when they absorb this radiation. (2 marks).
The protons have a property called _________which __________when radiation is absorbed.

Complete the table to show values for the chemical shift of the different ¹H nuclei in methyl propanoate and their splitting pattern.

Use the data booklet for information about chemical shifts. (2 marks)

RGSHW Year 13 Chemistry - self assessment instrumental analysis

Annotate the peaks on the show your work section.Identify the finger print region.

Write the fragmentation equations for each of the peaks above.Upload your answer to the show your work section.

What can be deduced about the structures of X and Y using all this information and the data booklet? Justify your answer. (4 marks)

Use the NMR spectra and your answer to (a) to deduce the structural formulae of X and Y. Justify your answer and explain why both NMR spectra are consistent with these structures. (6 marks)

An organic compound X is an ester found in orange peel and has the molecular formula C5H10O3. Identify the bonds responsible for the peaks labelled Q and R in the infrared spectrum of X shown below, referring to your data booklet.

X was heated under reflux with dilute sulfuric acid. The resulting mixture was distilled, and a liquid Y was collected. The mass spectrum of Y is shown below. (i) Identify Y, by name or formula, using the information available. Use two pieces of data from the mass spectrum to support your answer.

The identity of Y could be confirmed using NMR spectroscopy. Predict the number of peaks in the low resolution proton NMR spectrum of Y. Give the chemical shift range for each peak, referring to your data booklet.

A second product from the reaction of X with hydrochloric acid is Z, which has the molecular formula C₄H₈O₃. What can you deduce about Z from the results of the following tests?

Use the results of these tests to deduce the structural formula of Z and hence the structural formula of X.

Complete the table to show values for the chemical shift of the different ¹H nuclei in methyl propanoate and their splitting pattern. Use the data booklet for information about chemical shifts. (2 marks)

Annotate the peaks on the show your work section.
Identify the finger print region.

Write the fragmentation equations for each of the peaks above.
Upload your answer to the show your work section.

Complete the table to show values for the chemical shift of the different ¹H nuclei in methyl propanoate and their splitting pattern.

Use the data booklet for information about chemical shifts. (2 marks)