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Which of the following is/are not correct with respect to energy of atomic orbitals of hydrogen atom? (A) 1s < 2p < 3d < 4s (B) 1s < 2s = 2p < 3s = 3p (C) 1s < 2s < 2p < 3s < 3p (D) 1s < 2s < 4s < 3d Choose the correct answer from the options given below :

1. (B) and (D) only
2. (A) and (C) only
3. (C) and (D) only
4. (A) and (B) only

Correct answer: (C) and (D) only

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