How many isomers are there for propene, C3H6 ?

Propene (C3H6) has two isomers:

Propene: This is the most common and well-known isomer of C3H6. It consists of three carbon atoms and six hydrogen atoms, with a double bond between two of the carbon atoms, giving it the chemical formula CH2=CH-CH3.

Cyclopropane: This isomer consists of a ring of three carbon atoms, each bonded to two hydrogen atoms. It has the chemical formula cyclo-C3H6 or simply C3H6. It is a cyclic compound with all carbon-carbon bonds being single bonds.

So, there are two isomers of C3H6: propene and cyclopropane.