Which of the following orbitals is not possible?

Which of the following orbitals is not possible?

The options are,

A) 1s

B) 2p

C) 3f

D) none of the above

Which of the following orbitals is not possible

Here is the tabulation of n and l values of the given orbitals in the options,

orbitals possible

Which of the following orbitals is not possible

 The 'l' value should be less than 'n' with minimum 'l' value starting from (n-1). Option C does not go with the same principle.
Hence, 3f orbital is not possible.

Option C is the correct choice for the given question.