Question

Which of the following statement is correct regarding diborane?

• A. The two bridged hydrogen atoms and the one boron atoms lie in one plane
• B. Out of six $B-H$ bonds, two bonds can be described in terms of $2$ -centre-$2$-electron bonds
• C. Out of six $B-H$ bonds, four $B - H$ bonds can be described in terms of $3$ -centre-$2$-electron bonds
• D. The four terminal $B-H$ bonds are $2$-centre-$2$-electron regular bonds

Answer 1

Answer: (D)

Statement (d) is correct, while other statements are incorrect. Corrected form are as follows :
(a) The four terminal hydrogen atoms and the two boron atoms lie in one plane. Above and below this plane, there are two bridging hydrogen atoms.
(b) The four terminal $B - H$ bonds are regular $2$ -centre-$2$-electron bonds.
(c) The two bridged $( B - H - B )$ bonds are different and can be described in terms of $3$ -centre-$2$-electron bonds.