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NEET2022Chemistry
Q.

Which of the following statement is not correct about diborane ?

  1. A

    The four terminal B-H bonds are two centre two electron bonds.

  2. B

    The four terminal Hydrogen atoms and the two Boron atoms lie in one plane.

  3. C

    Both the Boron atoms are sp hybridised

  4. D

    There are two 3-centre-2-electron bonds.

Solution

In diborane (BH), each boron is bonded to four hydrogens: two terminal (regular 2c-2e bonds) and two bridging (in 3c-2e B-H-B banana bonds).

Four bond regions around each boron require sp hybridisation, not sp. So statement (3) is incorrect.

The terminal B-H bonds and the two borons lie in a common plane, while the bridging hydrogens lie above and below this plane. The molecule is non-planar overall.

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