Vulcanisation of rubber

Q.

Which of the following is true about Ebonite ?

1. Ebonite Is A Natural Rubber

2. Ebonite is a synthetic rubber

3. Ebonite Is Highly Vulcanized Rubber

4. None Of These

Q. Which of the following is used in vulcanization of rubber?

1. $S{F}_6$
2. $C{F}_4$
3. $C{l}_2{F}_2$
4. $C_2{F}_2$