How do you draw the isomer moulecule 3-ethyl-2,4,5-trimethyloctane

Question

Draw the isomer below based on its name. (Hint, start by drawing the base hydrocarbon, octane, and then draw the ethyl and methyl groups off of the correct carbons.) It must be labeled with atoms and compounds

3-ethyl-2,4,5-trimethyloctane

Answer 1

Hello, Maya,

I can't easily draw a molcule, especially with the hydrogens attached. Here is the carbon backbone. Just add H's until each carbon has 4 bonds.

C - C

I

C - C - C - C - C - C - C - C

I I I

C C C

The octane is the center backbone of 8 carbons.. The carbons on the octane are numbered from left to right, statring with the nside that has the largest nearby groups hanging off the backbone.

3-ethyl-2,4,5-trimethyloctane

C - C

I

C - C - C - C - C - C - C - C

I I I

C C C

1 2 3 4 5 6 7 8

The attached groups (ethyl and three methyl groups) are identified by their carbon location. Thus, we can see that the ethyl group is on the 3rd carbon and the three methyl groups are on the 2, 4, and 5 carbons, thus the name 3-ethyl-2,4,5-trimethyloctane.

Bob