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7. Terpenes consist of joined isoprene units (2-methylbuta-1,3-diene) - Scottish Highers Chemistry - Question 7 - 2018

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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

Circle an isoprene unit on the myrcene structure below.

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Answer

An isoprene unit can be circled in the myrcene structure as follows:

    H2C       CH3
     |         |
H2C=C     C-CH
     |         |
    CH2      CH

Step 2

Name the class of terpene to which humulene belongs.

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Answer

Humulene belongs to the class of terpenes called sesquiterpene.

Step 3

Calculate the mass of squalene required to produce a batch of 500,000 doses of flu vaccine.

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Answer

To calculate the mass of squalene required:

  1. Find the total mass for 500,000 doses:

    (\text{Total mass} = 10.69 , \text{mg} \times 500,000 = 5,345,000 , \text{mg})

  2. Convert to kg:

    (\text{Mass in kg} = \frac{5,345,000 , \text{mg}}{1,000,000} = 5.345 , \text{kg})

Thus, 5.345 kg of squalene is required.

Step 4

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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Answer

To fully saturate one mole of squalene, 6 moles of hydrogen are needed.

Step 5

Name the type of reaction taking place.

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Answer

The type of reaction taking place is addition.

Step 6

Explain why no reaction takes place.

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Answer

No reaction takes place when terpineol is heated with copper(II) oxide because terpineol is a tertiary alcohol and tertiary alcohols cannot be oxidised.

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