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Stress Pattern

Number of Syllables

Primary Stress

ro TA tion

3

second

Suggested exercises

1. Explain why we find rotation about single bonds but not about double bonds, and how we can tell whether there is rotation.
F

Useful words

pi bond would break
isolate cis and trans isomers
usually cannot isolate rotational isomers
exceptions: steric hindrance
equivalent methyl protons in the NMR
distinct chemical shift of cis and trans isomers
F

2. How would you help a student who can't understand that rotation about a single bond does not produce chemically distinct isomers?
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models
make drawings from different perspectives
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