Which among the following is not a property of silicones?

$Me_3SiCl$ is used during the polymerisation of organosilicones because:

Holme signal can be given by using which of the following mixtures?

$A$ compound $A$ is used in paints instead of salts of lead. Compound $A$ is obtained when a white compound $B$ is strongly heated. The compound $B$ is insoluble in water but dissolves in $NaOH$ solution,forming a solution of compound $C$. The compound $A$ on heating with coke gives a volatile metal $D$ and a gas $E$ which burns with a blue flame. Identify the possible species $D$ and $C$ respectively.

What is the formula of the product formed when $F^{-}$ reacts with enamel on teeth?

Which of the following statements are correct?
$I)$ $SnF_4$ is ionic in nature.
$II)$ Stability of dihalides of group $14$ elements increases down the group.
$III)$ $GeCl_2$ is more stable than $GeCl_4$.