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

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry-p-Block elements - I1 Mark
MCQ
The structure of diborane $({B_2}{H_6})$ contains
  • ✓
    Four $2c$ - $2e$ bonds and two $3c$ - $2e$ bonds
  • B
    Two $2c$ - $2e$ bonds and four $3c$ - $2e$ bonds
  • C
    Two $2c$ - $2e$ bonds and two $3c$ - $3e$ bonds
  • D
    Four $2c$ - $2e$ bonds and four $3c$ - $2e$ bonds
✓

Answer

Correct option: A.
Four $2c$ - $2e$ bonds and two $3c$ - $2e$ bonds
a
(a) $3c - 2e:B - H - B$;

$2c - 2e:H - B - H$

$\begin{array}{*{20}{c}}
  {^H} \\ 
  {_H} 
\end{array}\begin{array}{*{20}{c}}
  \backslash  \\ 
  / 
\end{array}B\begin{array}{*{20}{c}}
  / \\ 
  \backslash  
\end{array}_H^H\begin{array}{*{20}{c}}
  \backslash  \\ 
  / 
\end{array}B\begin{array}{*{20}{c}}
  / \\ 
  \backslash  
\end{array}_H^H$

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