Is this the E or Z isomer of 3-isopropyl-2-heptene?

My book says Z, but I would think it's E. On the left, there is no doubt which group has higher priority. I would believe that on the right side, the lower group has the higher priority because there is a longer chain of C-atoms.

 

Zusammen is correct. Follow the rules for establishing priority. The isopropyl group has 2 carbons attached to the atom in question. The other chain only has one.

John

 

These forums are going to get pretty slow when you graduate..

 

Sorry if I'm posting too much.

 

What, you think I want dead forums? I'm just waiting until you ask something I can answer that jpan hasn't already answered..

 

I teach all day Thursday, so have at it. John

 

12 threads in four years until I started posting. It used to be dead, indeed.