Pick out correct statements regarding orystalline form of boran

1.	Pick out correct statements regarding orystalline form of boran
Answer» All allotropic forms of boran contais is icosahedral units with boran ATOMS at all 12 corners. In `B_(12)` units each boran atoms is bonded to five boran atoms as a distance of `1.77 Å` `alpha` - RHOMBOHEDRAL FORM of boran consists of layers of icosahedra linked with in each layer by three centre B-B bonds and between layers B-B bonds `beta` - rhombohedral form consists of `12B_(12)` icosahedra arranged icoshedral about central `B_(12)` unit `(B_(12)(B_(12))_(12))` Solution :Allotropy of boron contains icosahedral units and boran atoms at 12 carbons. In `B_(12)` units each boran atom is bonded to 5 boron atoms `beta` rhombo hedral consists of 12 `B_(12)` icosahedral arrangement.

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