The chain length of silicones can be controlled by adding:
1. \(\mathrm{CH_3SiCl_3}\)
2. \(\mathrm{SiCl_4}\)
3. \(\mathrm{(CH_3)_2SiCl_2}\)
4. \(\mathrm{(CH_3)_3SiCl}\)
The compound among the following that used in cosmetic surgery is:
1. Silica
2. Silicates
3. Silicones
4. Zeolites