KCET 2017 Chemistry Solved Paper

Electron dot structure of N2O molecule
First draw the main skeleton structure of N2O having N-N-O connectivity with single bonds without showing any formal charge, that is,Total number of valence electrons =(5×2)+(6×1)=16e−s
Four electrons are used to form two bonds in the skeleton structure
Remaining valence electrons =16−4=12
The central nitrogen atom needs two more lone pairs, terminal nitrogen atom needs three more lone pairs and oxygen atom needs three more lone pairs to complete their octet.
Therefore, total 16 electrons are needed. But we have 12 electrons.
Hence, 2 additional bonds are formed, which can be placed in three different ways,
The most appropriate structure of N2O is The resonating structures of N2O are as follows: