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What is the cetane value of α-methyl naphthalene?
1. 100
2. 0
3. 75
4. 50

1 Answer

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Correct Answer - Option 2 : 0

Explanation:

Alpha-methylnaphthalene (C11H10) has a cetane number of zero.

  • Cetane number is an indicator of the combustion speed of diesel fuel and compression needed for ignition.
  • Cetane has a cetane number defined to be 100.

  • Alpha-methylnaphthalene has been replaced as a reference fuel by heptamethylnonane, whose cetane number is 15.
  • It plays a similar role for diesel as octane rating does for gasoline.
  • The cetane number of a blend is calculated as a volume-weighted average

          cetane number = % n-cetane + 0.15(% heptamethylnonane)

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