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

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 11 - 4. Chemical bonding and molecular structure4 Marks
MCQ
The relatively high boiling point of $HF$ is due to
  • ✓
    Hydrogen bonding
  • B
    Covalent bonding
  • C
    Unshared electron pair on $F$
  • D
    Being a halogen acid
✓

Answer

Correct option: A.
Hydrogen bonding
a
Since fluorine is more electronegative than nitrogen, $H - F$ bonds are much more polar than $N - H$ bonds. Due to the high partial charges on $H$ and $F$ in $HF$, a Hydrogen bond between $HF$ molecules is much stronger than that between $NH_3$ molecules. The high boiling point of $HF$ is thus due to the strong $H$-bond.

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