The reference compound $iso$-octane,which is used in determining the octane number of gasoline,has the structure:

  • A
    $CH_3-CH(CH_3)-CH(CH_3)-CH(CH_3)-CH_3$
  • B
    $CH_3-C(CH_3)_2-CH_2-CH(CH_3)_2$
  • C
    $CH_3-C(CH_3)_2-CH(CH_3)-CH_2-CH_3$
  • D
    $CH_3-C(CH_3)_2-C(CH_3)_2-CH_3$

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