Q27 / 160 · TS EAMCET 2024 (10 May Shift 2) · Chemistry

The correct order of boiling points of hydrogen halides is

  • A
    $\mathrm{HF} \lt \mathrm{HCl} \lt \mathrm{HBr} \lt \mathrm{HI}$
  • B
    $\mathrm{HI} \lt \mathrm{HBr} \lt \mathrm{HCl} \lt \mathrm{HF}$
  • Correct answer
    C
    $\mathrm{HCl} \lt \mathrm{HBr} \lt \mathrm{HI} \lt \mathrm{HF}$
  • D
    $\mathrm{HBr} \lt \mathrm{HCl} \lt \mathrm{HI} \lt \mathrm{HF}$

Solution

Boiling point of hydrogen halides are $\mathrm{HF}\gt\mathrm{HI}\gt\mathrm{HBr}\gt\mathrm{HCl}$ HF have hydrogen bond so its boiling point is high. Also as molecular mass increases boiling point of other halide increases.

Hence, the correct answer is option: 'C'.

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