Based on the structures $P$, $Q$, and $R$ defined as $P = OHC-CH_2-CH=CH-CH_2-CHO$, $Q = HO-CH_2-CH_2-CH_2-CH_2-CH_2-CH_2-OH$, and $R = HO-CH_2-CH_2-CH=CH-CH_2-CHO$, which of the following statements is correct?

  • A
    $P$ is a dialdehyde.
  • B
    $Q$ is a diol.
  • C
    $R$ is a hydroxy aldehyde.
  • D
    Both $(B)$ and $(C)$ are correct.

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