Organic chemistry

EasyMedium
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556
Question 20
Easy

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?

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

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

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

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

Organic chemistry Questions

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