Which of the following transitions is the highest energy transition?

Which of the following transitions is the highest energy transition?

مندرجہ ذیل میں سے کون سا ٹرانزیشن سب سے زیادہ توانائی کی منتقلی ہے؟
Explanation

σ to σ* transition requires the highest energy.

Because it involves the breaking of a strong sigma bond.