Transcript F322 revision - DrBravoChemistry

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F322 revision
L.O.:
Consolidate application of synthetic
knowledge on alcohols,
halogenoakanes, esters and alkenes.
 Develop the exam technique
required to gain full marks in exam
questions
c
A
B
D
1)
2)
3)
4)
K2Cr2O7
1)
H2SO4, heat
2)
A
K2Cr2O7
3)
H2SO4, heat
Task: improve exam answers
a) Predict two fragment ions that you would
expect to see in the mass spectrum of
butan-1-ol and state the m/z value of each ion.
• (i) why the organic product is likely to be
ethanal if the apparatus shown in Fig. 3.1 is
used.
Ethanal is formed when you use distillation
Mark scheme:
o volatile components can escape out.
o only partial oxidation takes place.
• ii) why the organic product is likely to be
ethanoic acid if the apparatus shown in Fig.
3.2 is used.
This is reflux, so ethanoic acid will be formed
Mark scheme:
o VOLATILE COMPONENTS CANNOT
ESCAPE.
o COMPLETE OXIDATION TO THE
ACID IS ACHIEVED.
The organic product collected when using the
apparatus shown in Fig. 3.1 is most likely to be
that shown by spectrum ….
C
Because …It has a C=O peak but no O-H peak
It is the aldehyde.
Mark scheme:
o Only shows absorption at 1700 cm-1 for C=O.
o The other spectra contain the OH absorption
at 3000 cm-1.
Triominoes
Match three outer
triangles to each of
the relevant central
topics