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-p-Block elements - I — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry-p-Block elements - I1 Mark
MCQ
Consider the following statements for diborane 

$1.$  Boron is approximately $sp^3$ hybridized

$2.$  $B-H-B$ angle is $180^o$

$3.$  There are two terminal $B-H$ bonds for each boron atom

$4.$  There are only $12$ bonding electrons available

Of these statements

  • ✓
    $1,\, 3$ and $4$ are correct
  • B
    $1,\, 2$ and $3$ are correct
  • C
    $2,\, 3$ and $4$ are correct
  • D
    $1,\, 2$ and $4$ are correct
✓

Answer

Correct option: A.
$1,\, 3$ and $4$ are correct
a
In diborane, boron atom undergoes sp $^{3}$ hybridization.

In diborane, the $\mathrm{B}-\mathrm{H}-\mathrm{B}$ angle is $83^{\circ}$.

Each boron atom is linked to two terminal hydrogen atoms and two bridged hydrogen atoms. There are four $2 \mathrm{c}-2 \mathrm{e}$ bonds and two $3 \mathrm{c}-2 \mathrm{e}$ bonds.

Hence, only 12 bonding electrons are available

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