What are the isomers of C3H6O?

I count 11 isomers of ##"C"_3"H"_6"O"##.

They are:

Prop-2-en-1-ol

(from commons.wikimedia.org)

Methoxyethene

Propanone

(from www.meritnation.com)

And its tautomer,

Prop-1-en-2-ol

Propanal

(from commons.wikimedia.org)

And its two tautomeric isomers

(##Z##)-Prop-1-en-1-ol

and

(##E##)-Prop-1-en-1-ol

Then we have

Cyclopropanol

Oxetane

(##R##)-Methyloxirane

(##S##)-Methyloxirane

And that makes 11 isomers!