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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3cb052

Which statements about diborane, , are correct?

  1. AThere are four two-centre two-electron B-H bonds
  2. BThere are two three-centre two-electron B-H-B bonds
  3. CAll six hydrogen atoms lie in one plane
  4. DThe bridging B-H bonds are longer than the terminal B-H bonds

Answer: A, B, D

Four terminal hydrogens form 2c-2e bonds and two bridging hydrogens form 3c-2e banana bonds. The bridging B-H distance (about 133 pm) exceeds the terminal one (about 119 pm). The two bridging H atoms lie above and below the plane containing the 2 B and 4 terminal H atoms, so the six H atoms are not coplanar.
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