Asked in PMC Practice Test 23 (2021) 2021Moderate

Liquid hydrocarbons is converted into gaseous hydrocarbon by:

Correct answer: A. Cracking

  • A. Cracking
  • B. Hydrolysis
  • C. Oxidation
  • D. Distillation

Explanation

Cracking is the process in which long chain hydrocarbons (in liquid/solid state) are broken into short chain, more useful hydrocarbons which have a smaller molecular mass/no. of atoms resulting in weaker instantaneous dipole induced dipole forces to hold the molecules close together so they are in gaseous form. Hence, there is a state change. Hydrolysis and oxidation have nothing to do with state change. The final product of distillation is collected in liquid form.

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About Alkanes

Alkanes are saturated hydrocarbons containing only carbon-carbon and carbon-hydrogen single bonds, with the general formula CnH2n+2 for open chains. Their structure, isomerism, IUPAC nomenclature, physical properties, combustion, free-radical halogenation and conformations are covered, including the difference between substitution in alkanes and addition in unsaturated hydrocarbons.

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