Chemistry

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I am really stuck on these so will try and explain further and use dots.
1. I have come up with normal heptane on this but not sure
.......CH3...CH3
.......|.....|
CH3-CH-C-CH2-C-CH2-CH3
....|....|...|
....CH3..CH2.CH2
.........|
.........CH3
In the first row CH3 and CH3 are both directly about the "C"'s in row two, in the third row, CH3 under CH, CH2 under CH2 and CH2 under C, in the fourth row, the CH3 is under the first CH2

2. Name this compound
.....CH3
.....|
CH=C-CH-CH-CH3
........|
........CH3
In the first row, CH3 is above the first CH, in the third row, CH3 is below the second CH

3. name this compound -
...........H..H
...........\../
........... C=C
.........../..\
..........CH3..CH2CH3

to the left of the equal sign you have h on top c in middle and CH3 under the H on the right side of equal sign you have H on H, C underneath to the left of H and CH2CH3 on the third row under H

4. name this compound

CH3-CH2....H
\.../
........C=C
......../..\
........H...CH2-CH-CH3
................|
................CH3

on the second row the C on left is to the right of the CH2 with the H on the third row under the CH2. On the right side of equal H is on top, c in the second row is to the left of H and on the third row CH2 is underneath H, fourth row, CH3 under CH of third row

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