I will try these again, as I am really struggling with these compounds. Hard going back to school after all these years.

Question

1. I will list the longest chain and then tell when items are placed above and below

CH3-C=CH-CH-CH3
above C is CH3
Below the second CH is CH2 and below that CH3

2. I will list the same way

CH(followed by triple bond)C-CH-CH-CH3
above the first CH after triple bond is CH3 and below the second CH after triple is CH3

3. With these C=C and H is above each C one to the left above and one to the right. Below to the left of C on left side is CH3 and below C on right to the right is CH2CH3

3. once again C=C and above the left C to the left is CH3-CH3 and below the C on left to the left is H. To the right above on C at right is H and below C on right and to right is CH2-CH-CH3 and directly below CH is CH3

Thanks

Answer 1

1 is
2-methyl-4-ethyl-2-heptene.

I can not guarantee that this follows all of the IUPAC rules.

Answer 2

I have struggled to deduce the structures from the descriptions, so I hope I have interpreted these OK.

Given compund 1 is

(CH3)2C=CH-CH(CH2CH3)-CH3

re-written this is

(CH3)2C=CH-CH(CH3)-CH2CH3

The longest C chain is C-6

so it is a hexene. Numbering from the left. This is

2,4-dimethyl-2-hexene

Compound 2

CH-=C-CH(CH3)-CH(CH3)-CH3

The longest chain is C-5 so it is a pentyne. Numbering from the left

3,4-dimethyl-1-pentyne.

Compound 3

CH(CH3)=C(H)-CH2-CH3

the longest chain is C-5 so it is a pentene. Numbering from the left

Z-2-pentene.

Compound 4

CH3-CH2-C(H)=C(H)CH2-CH(CH3)-CH3

so the longest chain is C-7

numbering from the right

E-2-methyl-4-heptene.