the unmber of c-c sigma bonds inal4c3 are
How many C–C sigma bonds are in Al₄C₃?
Answer: There are 0 C–C sigma bonds in aluminum carbide (Al₄C₃). Each carbon atom is best viewed as having four single bonds to aluminum atoms (in effect forming C⁴⁻ “methanide” units), and there are no direct C–C bonds in its crystal lattice.
To understand why, consider these key points:
- In Al₄C₃, each Al is approximately in a +3 oxidation state, for a total of +12 from aluminum.
- The three carbon atoms together balance this with –12 total charges when each carbon is considered as C⁴⁻.
- This arrangement implies each carbon atom bonds with four aluminum atoms (much like a tetrahedral arrangement), leaving no room for C–C bonding.
- The hydrolysis reaction of Al₄C₃ producing methane (CH₄) supports the idea of discrete C⁴⁻ centers without C–C linkages.
Below is a summary table:
| Parameter | Details |
|---|---|
| Chemical Formula | Al₄C₃ |
| Possible Carbon Oxidation State | C⁴⁻ (methanide ion) |
| Aluminum Oxidation State | +3 |
| C–C Sigma Bonds Count | 0 |
| Reasoning | Each C bonds to 4 Al atoms, forming no C–C linkages |
| Hydrolysis Product | CH₄ (methane), supports C⁴⁻ configuration |
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