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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
In which of the following compounds $B-F$ bond length is shortest?
  • A
    $BF_4$
  • B
    $BF_3 \leftarrow NH_3$
  • C
    $BF_3$
  • D
    $BF_3 \leftarrow N(CH_3)_3$
✓

Answer

$(c)$ Only in $BF_3\, \,p \pi - p \pi$ back bonding is possible due to which $B-F$  bond length is shortest. In other compounds, $p-$ orbital at boron is not vacant hence, $p \pi - p \pi$ back bonding is not possible. Water molecules are  hexagonally closed pocked in ice with the help of $H-$ bonds, hence due to existance of voids/interstitial spaces it has cage like structure with less density  than water.

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