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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
Strongest intermolecular hydrogen bond is present in the following molecules pairs
  • A
    $Si{H_4}$ and $SiF$
  • B
    $C{H_3} - \mathop C\limits^{\mathop {||}\limits^O } - C{H_3}$ and $CHC{l_3}$
  • ✓
    $H - \mathop C\limits^{\mathop {||}\limits^O } - OH$ and $C{H_3} - \mathop C\limits^{\mathop {||}\limits^O } - OH$
  • D
    ${H_2}O$ and ${H_2}{O_2}$
✓

Answer

Correct option: C.
$H - \mathop C\limits^{\mathop {||}\limits^O } - OH$ and $C{H_3} - \mathop C\limits^{\mathop {||}\limits^O } - OH$
c
The pair of molecules which forms the strongest intermolecular hydrogen bonds is formic acid $HCOOH$, and acetic acid $CH _3 COOH$. A hydrogen bond is the electrostatic attraction between polar molecules that occurs when a hydrogen $( H )$ atom bound to a highly electronegative atom such as nitrogen $(N)$, oxygen $(O)$ or fluorine $(F)$ experiences attraction to some other nearby highly electronegative atom.

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