Which of the following tests confirms the presence of an aldehydic group in glucose?

  • A
    Formation of oxime when reacted with $NH_2OH$.
  • B
    Formation of gluconic acid when reacted with $Br_2$ water.
  • C
    Formation of saccharic acid when glucose and gluconic acid are treated with dilute $HNO_3$.
  • D
    Formation of penta-acetate when treated with acetic anhydride.

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