Determine the exact number of 3-center-2-electron () bonds present in one molecule of diborane (). — Chemical Bonding Chemistry Question

💡 Solution & Explanation

In $B_2H_6$, there are four terminal $B-H$ bonds that are normal covalent bonds. The remaining two hydrogen atoms bridge the two boron atoms, creating two distinct $B-H-B$ electron-deficient "banana" bonds, where 2 electrons hold 3 nuclei together.