Identify the incorrect statement:

In $\displaystyle \left(\mathrm{Si}_3 \mathrm{O}_9\right)^{6-}$, tetrahedral $\displaystyle \mathrm{SiO}_4$ units share two oxygen atoms

Trialkylchlorosilane on hydrolysis gives $\displaystyle \mathrm{R}_3 \mathrm{SiOH}$

$\displaystyle \mathrm{SiCl}_4$ undergoes hydrolysis to give $\displaystyle \mathrm{H}_4 \mathrm{SiO}_4$

$\displaystyle \left(\mathrm{Si}_3 \mathrm{O}_9\right)^{6-}$ has cyclic structure