why ccl4 is resistant to hydrolysis but sicl4 is readily hydrolysed ?
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CCl4 can not be hydrolysed due to the absence of d-orbital in the valence shell of carbon atom (2s2 2p2). As a result, carbon can not increase its coordination number beyond four, and therefore, it can not accept electrons from water molecules.
SiCl4 on the other hand,is hydrolysed by water because silicon has vacant 3d orbital in its outermost shell. As a result, it can extend its coordination number beyond four. The vacant 3d orbital accepts lone pair electrons from water molecule forming silicic acid.
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Hope this helps.
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