In the series $HCl$,$HBr$ and $HI$,the boiling point increases in the order $HCl < HBr < HI$. This is due to

  • A
    $HI$ is the strongest acid among the series
  • B
    $HI$ is the strongest reducing agent among the series
  • C
    higher van der Waals' forces of attraction in $HI$
  • D
    intermolecular $H$-bonding in $HI$

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