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JEE Advanced levelSingle correct optionDifficulty 3 of 3cb080

Which statement about diborane, $B X_{2} H X_{6}$ , is correct?

AEach boron is $s p^{2}$ hybridised and all B-H bonds are ordinary two-centre two-electron bonds
BEach boron is $s p^{3}$ hybridised and all eight B-H bonds are ordinary two-centre two-electron bonds
CEach boron is $s p^{3}$ hybridised and the two bridging hydrogens are held by three-centre two-electron bonds
DEach boron is $s p^{3}$ hybridised and the bridges are three-centre four-electron bonds

Answer: C

Each boron uses four

s p^{3}

orbitals: two form normal 2c-2e bonds to terminal H and two take part in the bridges. There are only 12 valence electrons, 8 in the four terminal bonds and 4 in the two B-H-B bridges, so each bridge is a three-centre two-electron bond.

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