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Catalytic reforming raises the octane number of naphtha chiefly by

  • A.converting paraffins into aromatics
  • B.cracking the naphtha into lighter gases
  • C.adding tetraethyl lead to it
  • D.removing the aromatics present

Answer: A

Aromatics have far higher octane numbers than the straight chain paraffins they replace. The process is also the refinery's principal source of hydrogen and of benzene, toluene and xylene. Lead additives have long been withdrawn.

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