Question

Are all the b-h bonds in b2h6 equivalent ?? Show with structure

Answer 1

No, there are two types of bonds in diborane, normal covalent bonds and three centred electron pair bond.

Structure-

Answer 2

Not all the B-H bonds in boron hydride are equivalent.

• The dimeric structure of $B_2H_6$ is as follows-
• The compound $BH_3$ unit dimerise to form $B_2H_6$.
• In this compound, there are four covalent bonds present between B and H atoms with a bond length of 119pm. Two hydrogen atoms act as a bridge and connect the two B atoms by a 3c-2e bond commonly known as the banana bond and the bond length is 131pm.

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