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JEE Main levelOne or more correct optionsDifficulty 2 of 3pb030

Select the correct statement(s) about diborane, $B X_{2} H X_{6}$ .

AAll six $B - H$ bonds have the same bond length.
BIt has two $B - H - B$ three-centre two-electron bridges.
CEach boron atom is $s p^{3}$ hybridised.
DAll eight atoms lie in a single plane.

Answer: B, C

Diborane has two bridge

B - H - B

banana bonds, so A is true. Terminal

B - H

bonds (about 119 pm) are shorter than bridging ones (about 134 pm), so B is false. Each B forms four bonds (two terminal and two bridge) and is

s p^{3}

, so C is true. The two B and four terminal H lie in one plane, while the two bridging H lie above and below it, so D is false.

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