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4. Chemical bonding and molecular structure — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry4. Chemical bonding and molecular structure1 Mark
MCQ
Which of the following compounds has the lowest boiling point?
  • A
    $HF$
  • B
    $HCl$
  • C
    $HBr$
  • D
    $HI$
✓

Answer

$(b)\, HCl$ has least boiling point among all halogen acids because it contains $V.W.$  force never contains $H-$ bond $HCl \underset {V.W.\,force}{\mathop{ < HBr < }}\,HI < \underset{H-bond}{\mathop{HF}}\,$

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