Can someone check / help me with Organic Chemistry

I would like someone to help me check my answers. The highlighted names are the answers. I don't think most of it is right though. :S
I also don't know how to do #'s 6,7,9,13 and 14.

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Thanks!

2) 2,5 - dimethyl octane
3) 2,2 - dimethyl - 3- hexene
6) 2-ethyle pentane
7) 4- ethyle -2,3-dimethyle heptane
8) 3,4-diethyle-2-hexene
9) the correct answer is one of thesetwo i don;t know which :
a) 2,7,8 - trimethyle decane
b) 3,4,9 - trimethyle decane
11) 3-ethyle-1,5,5-trimetyle cyclohexene
12) 1,2-dimethyle-6-propyle cyclodecane
13) trans -2-penthene
14) 2-pentyne
1,4,5 & 10 were correct.
any other question : alireza.khadembashi@gmail.com

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