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Organic chemistry

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Question 15

During the fractional distillation of crude oil in a refinery, a chemical engineer separates a hydrocarbon mixture into four fractions with different boiling ranges:

  • Fraction WWW: 40 to 100∘C40\text{ to }100^\circ\text{C}40 to 100∘C
  • Fraction XXX: 110 to 180∘C110\text{ to }180^\circ\text{C}110 to 180∘C
  • Fraction YYY: 180 to 250∘C180\text{ to }250^\circ\text{C}180 to 250∘C
  • Fraction ZZZ: 250 to 350∘C250\text{ to }350^\circ\text{C}250 to 350∘C

Which statement correctly describes the properties and behavior of these fractions?

A

Fraction ZZZ is collected near the top of the fractionating column and has the highest volatility.

B

Fraction WWW has the strongest London dispersion forces between its molecules and is the most viscous.

C

Fraction YYY has a higher average carbon chain length than fraction XXX, resulting in weaker intermolecular forces.

D

Fraction WWW has the highest volatility and will ignite more readily than fraction ZZZ.

Markscheme

Organic chemistry Questions

  1. GCSE
  2. /Chemistry
  3. /Organic chemistry

83 exam-style questions on OCR GCSE Chemistry Organic chemistry. Each one has a worked solution and a mark scheme showing where the marks go.

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