Which of the following compounds will not show resonance?
Which of the following compounds will not show resonance?
The correct option is
C
Criteria to show resonance:
It is shown by compounds where there is the possibility of delocalization of electrons.
Delocalisation is seen in conjugated systems where there are alternate single and double bonds
present.
Delocalisation can occur via :
π-π orbital overlap
π-σ orbital overlap
π-p orbital overlap
In structures where electrons are localized, there is no possibility of resonance.
All atoms undergoing resonance should lie on the same plane.
In case of 
, though positive charge and π-bonds are at alternate positions but the octet of N is complete. That is why this molecule will not exhibit the phenomenon of resonance. Look carefully, there is no lone pair of electrons on the nitrogen atom, eliminating the chance of any resonance.
The correct option is
C
Criteria to show resonance:
It is shown by compounds where there is the possibility of delocalization of electrons.
Delocalisation is seen in conjugated systems where there are alternate single and double bonds
present.
Delocalisation can occur via :
π-π orbital overlap
π-σ orbital overlap
π-p orbital overlap
In structures where electrons are localized, there is no possibility of resonance.
All atoms undergoing resonance should lie on the same plane.
In case of , though positive charge and π-bonds are at alternate positions but the octet of N is complete. That is why this molecule will not exhibit the phenomenon of resonance. Look carefully, there is no lone pair of electrons on the nitrogen atom, eliminating the chance of any resonance.
