CHO3021A
SPECTROSCOPY
STUDENT INSTRUCTIONS
Overview
This assignment is designed to give you practice in demonstrating your understanding of
Chemistry. It is not for NCEA credit, but it will help you to develop your skills, so that you do well in future assessments.
Conditions
• You should already have studied the first four lessons of CHO3051 and completed questions 1a, 1bi, 2a, 2b, 3ai and 3aii of CHO3051A.
• There is no time limit for this activity, but allow about three hours to finish it. If you have any questions, please contact your teacher now.
A Periodic Table and correlation tables for IR and 13C NMR spectra are supplied near the
back of this assignment. Some common fragments in mass spectrometry are also provided.
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Assessment criteria
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Not Attempted
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Not yet on target for Achieved
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On target for Achieved
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On target for achieved with Merit
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On target for achieved with Excellence
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Did not attempt to complete
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Did not
demonstrate an understanding of spectroscopic
data in
chemistry.
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Identified
discrete aspects of the structure
of organic
molecules using teacher-provided spectroscopic
data.
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Determined
the structure
of organic
molecules using spectroscopic
data.
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Justified the structure
of organic
molecules by integrating
spectroscopic data.
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For teacher use only
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QUESTION ONE
From the following mass, 13C NMR and IR spectra shown for compounds A, B and C, give the formulae, structures and names of the unknown compounds. In each case, justify your choice of formula and structure.
Tip: It is recommended that you write notes on the spectra as extra evidence to support your report.
(a)
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Molecular mass:
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Elements present or absent
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Reasons
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Functional groups (present and absent): Include reasoning.
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Molecular formula =
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Possible structures:
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Reasoning for best fit:
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Name of
compound:
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(b)
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Molecular mass:
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Elements present or absent
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Reasons
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Functional groups (present and absent): Include reasoning.
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Molecular formula =
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Possible structures:
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Reasoning for best fit:
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Name of
compound:
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(c)
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Molecular mass:
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Elements present or absent
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Reasons
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Functional groups (present and absent): Include reasoning.
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Molecular formula =
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Possible structures:
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Reasoning for best fit:
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Name of
compound:
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