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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
$B{F_3}$ and $N{F_3}$ both molecules are covalent, but $B{F_3}$ is non-polar and $N{F_3}$ is polar. Its reason is 
  • A
    In uncombined state boron is metal and nitrogen is gas
  • B
    $B - F$ bond has no dipole moment whereas $N - F$ bond has dipole moment
  • C
    The size of boron atom is smaller than nitrogen
  • ✓
    $B{F_3}$ is planar whereas $N{F_3}$ is pyramidal
✓

Answer

Correct option: D.
$B{F_3}$ is planar whereas $N{F_3}$ is pyramidal
(d) $B{F_3}$ is planar while $N{F_3}$ is pyramidal due to the presence of lone pair of electron on nitrogen in $N{F_3}$.

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