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The metallic sound produced by engine due to the pre-ignition of fuel is called _______________?

Correct answer: A. knocking

  • A. knocking
  • B. reforming
  • C. cracking
  • D. a and c

Explanation

Knocking is the metallic sound caused by abnormal, premature or uncontrolled ignition of the fuel-air mixture in an engine. Reforming changes hydrocarbon structure to improve fuel quality, while cracking breaks large hydrocarbons into smaller ones. Students may choose cracking because it is another petrol-related process, but it does not produce the engine sound.

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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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