CHO3021A SPECTROSCOPY

发布时间：2024-06-21

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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.

Assessment criteria

Not Attempted

Not yet on target for Achieved

On target for Achieved

On target for achieved with Merit

On target for achieved with Excellence

Did not attempt to complete

Did not

demonstrate an understanding of spectroscopic

data in

chemistry.

Identified

discrete aspects of the structure

of organic

molecules using teacher-provided spectroscopic

data.

Determined

the structure

of organic

molecules using spectroscopic

data.

Justified the structure

of organic

molecules by integrating

spectroscopic data.

For teacher use only

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)

Molecular mass:
Elements present or absent		Reasons
Functional groups (present and absent): Include reasoning.

Molecular formula =
Possible structures:
Reasoning for best fit:
Name of compound:

(b)

Molecular mass:
Elements present or absent			Reasons
Functional groups (present and absent): Include reasoning.
Molecular formula =

Possible structures:

Reasoning for best fit:

Name of

compound:

(c)

Molecular mass:
Elements present or absent			Reasons
Functional groups (present and absent): Include reasoning.
Molecular formula =

Possible structures:

Reasoning for best fit:

Name of

compound: