p-Block elementsHardBloom L1

Question

Which of the following statements is/are correct regarding B2H6?

Options

A.banana bonds are longer but stronger than normal B–H bonds
B.B2H6 is also known as 3c–2e compound
C.the hybrid state of B in B2H6 is sp3 while that of sp2 in BH3
D.it cannot be prepared by reacting BF3 with LiBH3 in the presence of dry ether

Solution

Sol. B2​H6​ has banana bonds which are 3c−2e (3 center 2 electron) bonds. These bonds are longer but stronger than normal B−H bonds. The hybrid state in B2​H6​ is sp3 while that of sp2 in BH3​. This can be shown from figure. When BF3​ reacts with LiBH4​ in the presence of dry ether diborane is the product as shown in reaction. 8BF3 ​+ 6LiBH4​ → B2​H6 ​+ 6LiBF4​

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