See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

Electronic configuration of 2 2 6 2 5 17Cl : 1s , 2s 2p 3s 3p I excited state: 2 2 6 2 4 1 1s ,2s 2p ,3s 3p 3d II excited state: 2 2 6 2 3 2 1s ,2s 2p ,3s 3p 3d III excited state: 2 2 6 1 3 3 1s ,2s 2p ,3s 3p 3d              n l is : 3 0 3 3 1 3 3 2             3 12 15 30    