Some statements about the structure of diborane are given belowA) Studies have confirmed that four hydrogens of diborane are one type and remaining two are of another typeB) Diborane contains two coplanar BH2 groupsC) Diborane is a planar moleculeD) Boron of diborane undergoes sp2 hybridizationThe correct statements above are

Diborane do not possess the ethane like structure, because in ethane formation 14 electrons are involved where as indiborane formation only 12 valency electrons are involved.Hence the diborane structure not similar to that of ethane.Experimental evidences for diborane structure I) From specific heat data values we can conclude that in between the two boron atoms free rotation is not possible.II) From electron diffraction studies in diborane two BH2 groups are present in one plane and bridged hydrogen atoms are perpendicular to the BH2 plane.                                                        III) From NMR and Raman  spectral analysis data in diborane two types of hydrogen atoms are present.a) Four terminal hydrogen atomsb) Two bridged hydrogen atoms.IV) Diborane on methylation gives tetramethylated diborane ,the bridged hydrogen atoms do not involve in methylation.V) From bond-length data in diborane in diborane two types of B — H bond lengths are present .a) Terminal B — H bond length1.19A0b) Bridged B — H bond length is 1.34A0