Which of the following statements is not correct?

Question

$\begin{array}{1 1}\text{Organosilicon polymers are known as silicones}\\\text{Silicones have the general formula }(R_2SiO)_n\text{ where }R=-CH_3-C_2H_5-C_6H_5,etc.\\\text{Hydrolysis of dialkyldichlorosilane produces cross-linked silicon polymer}\\\text{Hydrolysis of alkyldichlorosilane produces cross-linked silicon polymer}\end{array}$