Statement I : Diborane is electron deficient molecule
Statement II : In the formation of diborane molecule, boron atom uses sp³ - hybrid orbitals

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I is false and II is true

Both the statements are true

I is true and II is false

Both the statements are false

answer is A.

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Detailed Solution

Diborane is electron-deficient i.e, there are not enough valence electrons to form the expected number of covalent bonds. For example, in diborane, there are only 12 electrons, three from each boron atoms and six from hydrogen, while ethane possesses 14 such electrons.
Each B atom uses sp³ hybrids for bonding. Out of the four sp³ hybrids on each B atom, one is without an electron shown in broken lines. The terminal B-H bonds are normal 2-centre-2- electron bonds but the two bridge bonds are 3-centre-2-electron bonds. The 3-centre-2-electron bridge bonds are also referred to as banana bonds

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