7. Terpenes consist of joined isoprene units (2-methylbuta-1,3-diene) - Scottish Highers Chemistry - Question 7 - 2018
Question 7
7. Terpenes consist of joined isoprene units (2-methylbuta-1,3-diene). They are classified by the number of isoprene units in the molecule.
(a) Myrcene and humulene... show full transcript
Worked Solution & Example Answer:7. Terpenes consist of joined isoprene units (2-methylbuta-1,3-diene) - Scottish Highers Chemistry - Question 7 - 2018
Step 1
i) Circle an isoprene unit on the myrcene structure below.
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Answer
Locate the isoprene unit in the myrcene structure, which typically consists of a branched structure containing a double bond before and after two single-bonded carbon atoms.
Step 2
ii) Name the class of terpene to which humulene belongs.
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Humulene belongs to the class of sesquiterpenes, as it is made up of three isoprene units.
Step 3
i) Calculate the mass of squalene required to produce a batch of 500000 doses of flu vaccine.
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To find the total mass of squalene required, multiply the amount per dose by the number of doses:
ii) State the number of moles of hydrogen needed to fully saturate one mole of squalene to produce one mole of squalane.
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To fully saturate one mole of squalene, you need six moles of hydrogen, since each double bond requires one mole of hydrogen for saturation.
Step 5
i) Name the type of reaction taking place.
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The reaction taking place is an addition reaction, where hydrogen is added across the double bonds.
Step 6
ii) Explain why no reaction takes place.
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Answer
No reaction occurs when terpineol is heated with copper(II) oxide because terpineol is a tertiary alcohol, which cannot be oxidized under these conditions.
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