Question
$CCl _4$ do not react with water while $SiCl _4$ easily react with water, why?

Answer

In $CCl _4$ the octet of carbon is complete and carbon do not have $d$-orbital. Hence it is not capable to accept electron pair from water. Hence it do not react with water. But in $SiCl _4, Si$ have vacant d-orbitals so that it easily accepts electron pair. Hence $SiCl _4$ easily react with $H _2 O$.
$
SiCl_4+2 H_2 O \longrightarrow SiO_2+2 HCl
$

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