How do you draw out the 3-methyl-1-hexene and 2-ethyl pentene?

Question

Im having a ahrd time naming out the structures. Any good sites that help with this O-chem stuff?

And how do you know where to put the double triple bonds ect...I totally forgot

Answer 1

Go to www.chemfinder.com. This is a good web site for veiwing stucutres and info on compounds. This site after about 4 searchs asks you to register, do it; its free.
In addition break it apart:
methyl
meth = 1 carbon chain
yl = means it is a branch off of the main chain.
3 = number of the carbon it is attached to
hexene
Hex = 6 carbon chain ( this is my longest contunous chain of carbons)
ene = double bond
1 means the double bond is located in between the first and second carbons

ethyl
eth= 2 carbon chain
yl = branch off the main chain
2 = the ethyl chain is located on the second carbon
pentene
pent = 5 carbons in the main chain
ene = double bond
Was there another number present in the 2-ethyl pentene?

Answer 2

3-Methyl is a CH3 group in the third position, 2-Heptyne is a 7 C chain with a Carbon Carbon triple bond in the two position i.e. if you count down the carbon chain. Hope that is helpful!

Answer 3

methyl means one, so it's an extra CH3 on the 3rd C and hex meanse six so six Cs in a chain with ene giving one double bond between the 1st and 2nd Cs.

ethyl-C2H5 goes on the 2nd C in a 5 C chain with one double bond.

Answer 4

CH2=CH-CH(CH3)-CH2-CH2-CH3

CH2=C(CH2CH3)-CH2-CH2-CH3 (assuming 2-ethyl-1-pentene)

The (CH3) and (CH2CH3) groups hang off the atom that precedes them.

Answer 5

3-methyl-1-hexene is:

CH2=CH2CH(CH3)CH2CH2CH3

2-ethylpentene is:

CH2=CH(CH2CH3)CH2CH2CH3