Which of the following species is/are a resonance form(s)of the species in the box?

Question

Quizplus · Accepted Answer

The species in the box is a carbocation with a positive charge on the carbon atom. 
Resonance forms involve moving electrons around, but in this case, there are no lone pairs or pi bonds to move. 
Possible resonance forms would involve delocalizing the positive charge through adjacent atoms. 
Option II is a valid resonance form because the positive charge can be delocalized onto the adjacent nitrogen atom. 
Option III is not a resonance form because it involves adding a lone pair to a carbon atom, which was not present in the original species. 
Option I is not a resonance form because it involves adding a pi bond, which was not present in the original species. 
Therefore, the correct answer is D) II.

Which of the Following Species Is/are a Resonance Form(s)of the Species