Definition Geometrical Isomerism?

Hi,

I am looking for the "perfect-exam-answer"-definition for a geometrical isomerism.
I have a book and a revision guide which both say, from my point of view completely different things.
what are the inportant words to score the points on?

And I am with AQA.

Cheers
Kathrin

Reply 1

HayleyChem

Geometric Isomerism results from restricted rotation around the carbon carbon double bond, with 2 different groups attached to the carbon in the double bond, i.e h and ch3

Hope that helps

Reply 2

Excalibur

Well, I've learnt the definition in my textbook: geometric isomerism is a type of stereoisomerism (where the two isomers only differ in the spatial arrangement) arising from the restricted rotation about the double bond, and where two different groups are attached to each of the carbon atoms in the double bond.