Question

Total $2c-2e$ and $3c-2e$ bonds in $Be(B{H}_4{)}_2$ are respectively :

• A. $8,4$
• B. $4,8$
• C. $4,4$
• D. $8,8$

Answer 1

Answer: (C)

$4,4$

Total $2c-2e$ and $3c-2e$ bonds in $Be(Be{H}_4{)}_2$ are $4,4$ respectively.
As can be seen in the following structure, there are four bridges that corresponds to $3c-2e$ bonds. Remaining $4$ bonds are $2c-2e$ bonds.