Scottish Highers Chemistry Fats and Oils: 7. Terpenes consist of joined is

Question

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 are terpenes present in hops which give beer its characteristic flavour and aroma.

(i) Circle an isoprene unit on the myrcene structure below.

![Myrcene Structure](image-reference)

(ii) Humulene has the molecular formula C15H24.
Name the class of terpene to which humulene belongs.

(b) Squalene, a triterpene, is included in some flu vaccines to enhance the body's immune response. A single dose of flu vaccine contains 10.69 mg of squalene.
Calculate the mass of squalene required to produce a batch of 500,000 doses of flu vaccine.
Your answer must be given in kg.

(ii) Squalene is a fully saturated hydrocarbon used in skin moisturising cream.
Squalene can be made by the reaction of squalene with hydrogen.

![Squalene Structure](image-reference)

State the number of moles of hydrogen needed to fully saturate one mole of squalene to produce one mole of squalane.

(c) The monoterpene limonene, found in lemon oil, can be converted into the alcohol, terpineol.

![Limonene to Terpineol Reaction](image-reference)

(i) Name the type of reaction taking place.

(ii) When terpineol is heated with copper(II) oxide, no reaction takes place.
Explain why no reaction takes place.

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

Worked Solution & Example Answer:7. Terpenes consist of joined isoprene units (2-methylbuta-1,3-diene) - Scottish Highers Chemistry - Question 7 - 2018

Name the class of terpene to which humulene belongs.

State the number of moles of hydrogen needed to fully saturate one mole of squalene.

Name the type of reaction taking place.

Explain why no reaction takes place.

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