Question

Arrange the various electronic transitions in the order of increasing energy.

(a) n→σ^* <  π→π^* <  n→π^* < σ→σ^*

(b) n→π^* <  π→π^* <  n→σ^* < σ→σ^*

(c) n→σ^* < n→π^* <  π→π^* < σ→σ^*

(d) σ→σ^* <  π→π^* <  n→π^* < n→σ^*

I got this question by my college director while I was bunking the class.

My enquiry is from Electronic Spectroscopy in section Absorption Spectroscopy of Engineering Chemistry I

Answer 1

Correct choice is (b) n→π^* <  π→π^* <  n→σ^* < σ→σ^*

For explanation: The correct order is- n→π^* <  π→π^* <  n→σ^* < σ→σ^*.