how can u say that conjugation is not present in propene?
Simply here it does nt possess alternate double bond system...!
but it has double bond between 1st and 2nd C-atom and single bond between the 3rd and 2nd C atom.Also according to the definition of the conjugation,there should be an atom which is directly bonded to another atom which is doubly bonded with any other atom.And in propene one C atom is attached to a C atom which is doubly bonded with another atom.
Propene shows hyperconjugation and due to this hyperconjugation, it doesn't show any bond resonance structures!
Any molecule where π electrons (that is, “electrons in p orbitals”) can be shared over more than 3 or more atoms can show conjuagtion!
Ok...so you mean to say that for showing conjugation,there should be two double bonds and one single bond at alternate positions..??
Sorry for late response--
These are the conjugated systems..!
Thank you very much....