In first and second which is stable i think first because negative charge on oxygen is stable n= n-o n = n = Ö: n-n =o > (in) )

Absolutely correct As negative charge is on oxygen and positive on nitrogen option a is the more stable than b

https://socratic.org/questions/how-many-resonance-structures-can-be-drawn-for-n-2o#:~:text=Dinitrogen%20monooxide%2C%20or%20N2,6%20from%20each%20oxygen%20atom. shweta read this ex...