organic chemistry-additions to alkenes?

Question

hello. i need help please with homework regarding addition to alkenes. anyone, please be so kind as to check my answers. my answers and links to the homework follow:

page 1:
http://img.villagephotos.com/p/2006-10/1223233/ochemhw8p1.JPG

page 2:
http://img.villagephotos.com/p/2006-10/1223233/ochemhw8p2.JPG

My answers:
1-B
2-B
3-A
4-A
5-A
6-A
7-B
8-A
9-D

Answer 1

1-C Hydroboration puts -OH on least substituted C; anti-Markownikov
2-B Correct
3-A Correct
4-C Br goes on the center C; product has two identical CH3CH2- groups on center C, therefore symmetrical and achiral
5-A Correct
6-A Correct
7-B Correct
8-A Correct
9-C Markownikov addition puts H on C next to C-CH3 and OH onto HO-C-CH3

Answer 2

i think of the additiona reactions quicker than substitution reaction because of the fact addition is including of two reactants to style one product. the potential will enhance from the floor state because of the fact the reactants approan one yet another. which consequence as speedy reaction.