Question

The total number of 3-centre-2-electron bonds in \( B_4H_{10} \) is ________. (in integer).

Hint:

In molecules like \( B_4H_{10} \), 3-centre-2-electron bonds are formed between boron and hydrogen atoms, and they play an important role in the bonding structure of boranes.

Answer 1

Correct Answer: 4

\( B_4H_{10} \) is known as tetrahydroborate, and it contains 3-centre-2-electron bonds in its structure. These bonds are formed by the sharing of electrons between three atoms. In \( B_4H_{10} \), there are two 3-centre-2-electron bonds in each of the four \( B-H \) groups, giving a total of: \[ \text{Total number of 3-centre-2-electron bonds} = 4 \times 2 = 8. \] Thus, the total number of 3-centre-2-electron bonds in \( B_4H_{10} \) is \( \boxed{4} \).