c) CH3–CH–CH3 2�?Methyl Propane 
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CH3 e) C9H20 Nonane
Probably, but there are 35 structural isomers with formula C9H20 ! 
f) CH3�?CH2)6–CH3 Octane 
g) H H H H H
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H–C–C–C–C–C–H Pentane 
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H H H H H
h) CH3
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CH3–CH2–CH2–CH2–CH 1–methylheptane
| That should be 3-methylheptane.
CH2
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CH3
i) CH3
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CH3�?CH2)3–C–CH3 1, 1–dimethylhexane
| Make that 2,2-dimethylhexane.
CH3
j) CH3 CH3
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CH3–C–––C–CH3 This one I don’t get it is just confusing!
| | There was an extra bond at the top that I removed.
CH3 CH3 This is 2,2,3,3-tetramethylbutane.
OK, coming along! Some of the bond alignments were off which may have caused a couple of the errors.
Steve