2 ethylpentane
My answer for this is a correct name and structure but my teacher said it is incorrect.. Why? Please explain.
Answer pls
Draw it out--which I can't do on this forum. Then count the LONGEST chain. It will be a hexane so it will be named as a 3-methylhexane.
I have tried drawing it. But its still correct..
Ch3-ch(c2h5)-ch2-ch2-ch3
I don't see anything wrong about this.
Ohh. Now i get it!! Thank you dr. Bob!
Great. Glad to help. You must be careful about "bunching up" ethyl, propyl, butyl groups. When you do that you forget about counting the carbons in those bunched up groups to make the longest chain--so you end up getting smaller chains than you would do otherwise.
It is possible that your teacher marked your answer as incorrect because there is a mistake in the name "2-ethylpentane." To confirm this, let's go through the process of correctly naming and creating the structure of this compound step by step.
To name a compound, we need to identify the longest continuous chain of carbon atoms. In this case, we can see that there are five carbon atoms in a row, so the root name will be "pentane."
Next, we need to identify and name any branches or substituents attached to the main carbon chain. In this compound, there is a two-carbon branch attached to the second carbon atom. This branch contains an ethyl group (C2H5-). Therefore, the compound should be named as 2-ethylpentane, indicating that the ethyl group is attached to the second carbon atom of the pentane chain.
Now let's discuss the structure. The skeletal formula for 2-ethylpentane represents the carbon atoms as a straight line and the hydrogen atoms attached to them as lines coming out at 120-degree angles. Since pentane has five carbon atoms in a row, we can draw the main chain as follows:
CH3-CH2-CH2-CH2-CH3
The ethyl group (C2H5-) is attached to the second carbon atom, so we replace one of the hydrogen atoms on that carbon with the ethyl group:
CH3-CH2-CH(CH3)-CH2-CH3
This structure represents 2-ethylpentane.
If you can submit a visual representation of your answer or provide more details about what your teacher specifically said was incorrect, I can provide further clarification.