I will try these again, as I am really struggling with these compounds. Hard going back to school after all these years.
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
1 is
2-methyl-4-ethyl-2-heptene.
I can not guarantee that this follows all of the IUPAC rules.
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.
Based on your descriptions, it seems like you are trying to identify the substituents (atoms or groups of atoms) attached to the main carbon chain in organic compounds. Here's a step-by-step guide to determine the substituents:
1. Identify the longest continuous carbon chain in the compound
- In the first example, the longest chain is CH3-C=CH-CH-CH3 (5 carbons)
- In the second example, the longest chain is CH≡C-CH-CH-CH3 (5 carbons)
- In the third example, I assume you meant to describe two different compounds, so let's go with the first one: C=C with substituents on both carbons.
2. Assign numbers to the carbon atoms in the main chain
- Start numbering from one end of the chain, giving the substituents the lowest possible numbers
- For example, in the first compound, the carbons are numbered as follows: 1-2-3-4-5
3. Determine the substituents attached to the main carbon chain
- Look at each carbon atom in the chain and identify the atoms or groups attached to it.
- In the first compound, you correctly identified the substituents above and below the main chain:
- Above C2: CH3
- Below C2: CH2
- Below C3: CH3
- In the second compound, you correctly identified the substituents as well:
- Above C1: CH3
- Below C2: CH3
- In the third compound (assuming you meant two separate compounds):
- Compound 1: C=C with a substituent on each carbon atom
- Above C1 (left): CH3-CH3
- Below C1 (left): H
- Above C2 (right): H
- Below C2 (right): CH2-CH-CH3 with CH3 directly below CH
- Compound 2: C=C with substituents on the left carbon only
- Above C1: CH3-CH3
- Below C1: H
By following these steps, you can systematically evaluate each carbon atom in the main chain and identify the substituents attached to it. Remember to consider both the atoms directly attached (above or below) and any branches extending from those atoms.