How many isomers (structural, geometric, and tereo) have the formula C5H10, and have "cyclo" in their name? (i.e. they contain a ring)

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a) Draw the chair conformations of 1, 4 – ditertbutyl cyclohexane. b) Determine the most stable and least stable conformations. Explain your answer.

Please provide an explanation

On the following energy diagram, identify the energy level of the cyclohexane conformation shown in the box. Energy (kJ/mol) A) I B) II CLU ||| IV Conformations 2

Q2. Answer any TWO of the following parts: (a) Draw the two main conformations that exist for cyclohexane. Explain clearly why one conformer is more stable than the other. Using cis-1-ethyl-3-methylcyclohexane, as an example, explain how ring flipping occurs. Draw both conformers of cis-1-ethyl-3-methylcyclohexane and explain clearly which one predominates. (b) What is polarimetry? The specific rotation of (R)-carvone is - 61°. A chemist prepared a 750 mg mixture of (R)-carvone and its enantiomer in 10 ml of ethanol and placed the solution in a 10 cm polarimeter cell. The observed rotation was - 4.125°. Calculate the specific rotation for the above mixture. What is meant by enantiomeric excess? Then determine the % enantiomeric excess (% ee) in the mixture. (i) (ii) (iii) What % of the mixture is (R)-carvone and (S)-carvone?

On the more stable conformations (number one part A drawing), can you label each of the carbons as primary, secondary, tertiary, or quaternary.

(B) Draw two chair conformations of the following substituted cyclohexane and identify the most stable conformation. Clearly show the axial and equatorial bonds.

Draw the structure of (1,1-dimethylethyl)cyclopentane. Select Draw Rings More H.

e. Assign the following alkene molecules as being cis or trans, E or Z isomers. H i) ii) iii) H CI H HOH₂C CI CI CH₂CH3