Degree of unsaturation

Degree of unsaturation is always a good way to guide the mind to find possible molecular formula.

The degree of unsaturation is the sum of the "pi-bond" and rings.

In this exercise you need to find the degree of unsaturation for various molecules.

You first need to take care that the valence of the nitrogen is 3 by adding charges !! Some exercises provide a valence of 5 which is wrong.