I’ve not seen this in any popular books. Neither did my sir in FIITJEE give this. I thought it would be good to share this information with the community. Not sure if many people know but just sharing this... ignore if you already know about this
Note this is not bcoz of 3 bond pairs.
Marked in red.
This is due to flipping of lone pairs of N that they are planar and inactive
Hp has some questions of this
Yes due to amine inversion bhaiya... actually I solved MSC. Currently solving HP. MSC did not have any question related to this.
But I think JEE will target these things.
It's there in any Resonance and Bansal Study Material along with Akshay Choudhary and M.S. Chouhan.
'Extra Information' like these are in most KOTA Coaching Material.