On passing vapours of an organic liquid over finely divided $Cu$ at $573 \, K$,the product was an alkene. This reaction is:

  • A
    Catalytic oxidation of primary alcohol
  • B
    Catalytic dehydrogenation of secondary alcohol
  • C
    Catalytic dehydrogenation of tertiary alcohol
  • D
    Catalytic dehydration of tertiary alcohol

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