Ozonolysis of Alkynes

Q. Ch3-ch(ch2)(CH3)-ch3---cl2-, uvlight---------major product will be

Q.

Ozonolysis of an organic compound gives formaldehyde as one of the products. This confirms the presence of :

1. A vinyl group
2. Two ethylenic double bonds
3. An isopropyl group

4. An acetylenic triple bonds

Q.

Propose structures for hydrocarbons that give the following products on oxidative cleavage by $KMn{O}_4$ or $O_3$:
$HOOC(C{H}_2{)}_{8}COOH$

1. 
2. 
3. 
4.