[dj.yoon1208]

Hi, I've got some problems with these two questions.

I am supposed to write structural formulas for the following compounds "methylpropene" and "5-ethyl-propyl-2-heptyne"

for 5-ethyl-propyl-2-heptyne, am i to assume that this is 5-ethyl and 5-propyl? 

any help and/or explanation will be thanked immensely! 

[Dan]

for 5-ethyl-propyl-2-heptyne, am i to assume that this is 5-ethyl and 5-propyl? 

Yes. Post your attempts, and we will help you out.

[dj.yoon1208]

for 5-ethyl-propyl-1-heptyne

would this be right..?
(assuming there is one extra line at the last carbon atom)

andd

what in the world is methylpropene?

[dj.yoon1208]

ohhh

for methylpropene, wouldnt that had to be 2-methylpropene, known as isobutylene ?

because for propene, only place methyl can be placed upon would be the middle, or 2-methyl.

but i still need some verification upon 5-ethyl-propyl-1-heptyne. 

[Yggdrasil]

ohhh

for methylpropene, wouldnt that had to be 2-methylpropene, known as isobutylene ?

because for propene, only place methyl can be placed upon would be the middle, or 2-methyl.

I agree.

but i still need some verification upon 5-ethyl-propyl-1-heptyne. 

I'm not sure this is correct, but maybe ethylpropyl refers to a single substituent instead of an two separate substituents.

[english]

Ethyl-propyl does not make any sense.