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Organic Chemistry

SOLUTION 5.4b

Alcohol OH would have higher frequency stretch compared to alkane CH and alkene CH. It is a similar reduced mass, but much stronger bond, making it resonate at a higher frequency.

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Lecture 5: Nomenclature and IR Spectroscopy 8 image_header 2020-03-22T12:09:03-07:00
Objectives and Skills

KEY INFORMATION SUMMARY

HERE you can find extra resources to help you with this lecture!

PROBLEMS

Problem 5.1: Functional Groups
1. Identify the functional groups present in piperine (below), an active component of black pepper. SOLUTION
2. How many units of unsaturation are in piperine? SOLUTION
If you made some mistakes or want to practice more, review the concepts that gave you trouble and work on this extra problem. If you're good, move to the problem below ;)

Problem 5.2: Molecule Polarity

Draw the Lewis Structures of (CH₃)₂CO, N(CH₃)₃, and BHF₂, identify the polar bonds and determine if the molecule is polar or non-polar and predict the direction of the dipole moment. SOLUTION

If you made some mistakes or want to practice more, review the concepts that gave you trouble and work on this extra problem. If you're good, move to the problem below ;)

Problem 5.3: Nomenclature
1. Give the IUPAC name for each of the following compounds: SOLUTION
1. Give the structures for the IUPAC names below: SOLUTION
7-bromo-1-chloro-2-methylheptane
              1,2,4-trimethylbicyclo[2.2.2]octane
              1,4-dichloro-2,2,3-trimethylcyclohexane
              3,3-dimethyl-4-propyl-1,5-octadiene
8,8-dimethyl-4-cycloocten-1-ol
1. 2-isopropyl-4-methylheptane is an incorrect name for this compound. What is the correct name? SOLUTION
If you made some mistakes or want to practice more, review the concepts that gave you trouble and work on this extra problem. If you're good, move to the problem below ;)

Problem 5.4: IR Spectroscopy
1. Which of the following would show the most intense C-H signal in an IR spectrum? Explain. SOLUTION
1. Which functional group would have the highest frequency IR signal? Explain. SOLUTION
Alcohol OH
Alkane CH
Alkene C=C
1. Determine the functional group present in the structure that leads to each of the following IR spectra. Label all significant IR peaks. SOLUTION
If you made some mistakes or want to practice more, review the concepts that gave you trouble and work on this extra problem. If you're good, move to the next lecture ;)