Question

What is the formula of cinnamic acid and how many isomers does this molecule have?

Answer 1

`C_6H_5CHCHCOOH`

see below

Explanation:

trans- and cis- isomers

From now on I will change only the `C_6H_5` molecule part.
And we get 5 more isomers.

NOTE:mistake `->` on the last example, the H atom on the second C-atom from the right is missing.