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Reforming a naphtha raises its octane number by converting straight chain molecules into

  • A.longer straight chains
  • B.saturated ring compounds with no branches
  • C.branched and aromatic ones
  • D.shorter straight chains only

Answer: C

Branched paraffins and aromatics resist pre-ignition far better than the straight chains they replace, and hydrogen is a valuable by-product. It changes the structure rather than the molecular size, which distinguishes it from cracking.

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