Polymerisation of Alkenes

Q. what is the repeating unit in organo silicon polymer ? name the starting material used in the manufacture of organo silicon polymer

Q.

The hydrides which are polymeric

1. BeH₂& CaH₂

2. MgH₂& BaH₂

3. BeH₂& MgH₂

4. BeH₂, MgH₂& SrH₂

Q. Which of the following is the monomer of polypropene?

1. $H_{2}C=CH-CH=C{H}_2$
2. $HC\equiv C-C{H}_3$
3. $H_{3}C-CH=C{H}_2$
4. None of the above