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Number of three-centre two-electron (3e-2e) bonds present in diborane is:
- a)2
- b)4
- c)6
- d)8
Correct answer is option 'A'. Can you explain this answer?
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Number of three-centre two-electron (3e-2e) bonds present in diborane ...
A three-center two-electron bond is an electron-deficient chemical bond where three atoms share two electrons. The combination of three atomic orbitals form three molecular orbitals: one bonding, one non-bonding, and one anti-bonding. The two electrons go into the bonding orbital, resulting in a net bonding effect and constituting a chemical bond among all three atoms. In many common bonds of this type, the bonding orbital is shifted towards two of the three atoms instead of being spread equally among all three. Examples of 3c-2e bonds are the trihydrogen cation H+
3 and the dimeric structure of aluminium chloride. This type of bond is also called banana bond.
Three-center two-electron bonds are seen in many boron compounds, such as diborane (B2H6). The monomer BH3 is unstable since the boron atom is only surrounded by six valence electrons. A B−H−B 3-center-2-electron bond is formed when a boron atom shares electrons with a B−H bond on another boron atom. In diborane, there are two such bonds: two H atoms bridge the two B atoms, leaving two additional H atoms in ordinary B−H bonds on each B. As a result, each boron is surrounded by a stable octet.
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Number of three-centre two-electron (3e-2e) bonds present in diborane ...
Explanation:
Diborane is a compound with the chemical formula B2H6. It contains two boron atoms and six hydrogen atoms. The boron atoms in diborane are sp3 hybridized and linked together by three two-electron three-center bonds.
The diagram below shows the structure of diborane.
From the structure, we can see that there are two three-centre two-electron bonds in diborane. These bonds are formed by the overlap of the p-orbitals of the boron atoms with the s-orbitals of the hydrogen atoms.
Therefore, the correct answer is option 'A' – there are 2 three-centre two-electron bonds present in diborane.
Diborane is a compound with the chemical formula B2H6. It contains two boron atoms and six hydrogen atoms. The boron atoms in diborane are sp3 hybridized and linked together by three two-electron three-center bonds.
The diagram below shows the structure of diborane.
From the structure, we can see that there are two three-centre two-electron bonds in diborane. These bonds are formed by the overlap of the p-orbitals of the boron atoms with the s-orbitals of the hydrogen atoms.
Therefore, the correct answer is option 'A' – there are 2 three-centre two-electron bonds present in diborane.
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Number of three-centre two-electron (3e-2e) bonds present in diborane is:a)2b)4c)6d)8Correct answer is option 'A'. Can you explain this answer?
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