Which of the following can be a conjugate system ?
What do you mean by conjunction or conjugate position?
When can a system can be considered to be in a conjunction?
Alternate position of the molecule having π bond, positive charge, negative charge,odd electron or lone pair of electrons are known as conjugative positions.
Note: Compound having at least two conjugate positions is known as conjugated compound.
Type of conjugates
(|) π,πconjugation:If all conjugate position have π bomds,then conjugation is known as π,πconjugation
All of the above compounds have π,πconjugation.
(||) Positive charge ,πconjugation : In this case all conjugation positions have π bonds and only one conjugation position has positive charge. If this is the case,then conjugation is known as positive charge,πconjugation.