In the series \( \mathrm{HCl}, \mathrm{HBr} \) and \( \mathrm{HI} \...

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In the series \( \mathrm{HCl}, \mathrm{HBr} \) and \( \mathrm{HI} \), the boiling point increases in the order \( \mathrm{HCl}\mathrm{HBr}\mathrm{HI} \). This is due to :
(a) \( \mathrm{HI} \) is the strongest acid among the series
(b) \( \mathrm{HI} \) is the strongest reducing agent among the series
\( \mathrm{P} \)
(c) higher van der waals' forces of attraction in \( \mathrm{HI} \)
(d) intermolecular H-bonding in \( \mathrm{HI} \)
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