p-Block Elements-I - Result Question 26-1
26. Starting from $\mathrm{SiCl}_4$, prepare the following in steps not exceeding the number given in parenthesis (give reactions only).
(i) Silicon
(ii) Linear silicon containing methyl group only
(iii) $\mathrm{Na}_2 \mathrm{SiO}_3$
(2001, 5M)
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Solution:
- (i) $3 \mathrm{SiCl}_4+4 \mathrm{Al} \xrightarrow{\Delta} 3 \mathrm{Si}+4 \mathrm{AlCl}_3$;
$Mg$ or $Zn$ can also be used.
(ii) $\mathrm{SiCl}_4+2 \mathrm{CH}_3 \mathrm{MgCl} \longrightarrow\left(\mathrm{CH}_3\right)_2 \mathrm{SiCl}_2+2 \mathrm{MgCl}_2$
$ \begin{aligned} & \text { (iii) } \mathrm{SiCl}_4+4 \mathrm{H}_2 \mathrm{O} \longrightarrow \underset{\text { Unstable }}{\mathrm{Si}(\mathrm{OH})_4}+4 \mathrm{HCl} \\ & \mathrm{Si}(\mathrm{OH})_4 \xrightarrow{\text { heat }} \mathrm{SiO}_2+2 \mathrm{H}_2 \mathrm{O} \\ & \mathrm{SiO}_2+\mathrm{Na}_2 \mathrm{CO}_3 \xrightarrow{\Delta} \mathrm{Na}_2 \mathrm{SiO}_3+\mathrm{CO}_2 \\ \end{aligned} $
BETA
