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Why CH4 and CCl4 are more resist to hydrolysis if compared to other silicon analog compound?
Winnievun
The tetrachloride of carbon (
[url=http://en.wikipedia.org/wiki/Tetrachloromethane]Tetrachloromethane[/url]) is a colorless liquid with tetrahedral molecules, CCl4. Unlike most other non-metal chlorides, it is not hydrolysed by water or by alkalis. There are two explanations for this:
Explanation 1:
There are no d-orbitals in the second shell of the C atom. As a result, when a water molecule attacks a CCl4 molecule, the carbon atom does not have an empty orbital to accept the incoming electron pair.
The problem with this explanation is that it suggests that the hydrolysis of halogenoalkanes by a similar mechanism, should also be impossible.
Explanation 2:
The difference in behavior of CCl4 and SiCl4 with water is a result of the much smaller size of a carbon atom compared to a silicon atom. As a result, it is impossible for water molecules to attack a carbon atom when it is surrounded by four relatively large chlorine atoms in CCl4 and is strongly bonded to them.
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∙ 15y ago
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