question_answer

Which one of the following statements about diborane is not true?

A)  The B atoms in it are \[s{{p}^{3}}\] hybridized

B)  It contains two 3-centre-2-electron bonds

C)  All B-H bond lengths in it are equal due to resonance

D)  The molecule is non-planar

E)  The molecule contains 12 valence electrons

Correct Answer: C

Solution :

                The structure of \[{{B}_{2}}{{H}_{6}}\](diborane) is as The bond length between \[B-{{H}_{t}}\] and \[B-{{H}_{b}}\] are 1.19 \[\overset{\text{o}}{\mathop{\text{A}}}\,\] and 1.37 \[\overset{\text{o}}{\mathop{\text{A}}}\,\] respectively. \[B-{{H}_{b}}\] is longer than \[B-{{H}_{t}}\]due to electron deficiency. Therefore, statement  about diborane is not true.