The electronic, identified by quantum numbers n and l, (i) `n = 4, l = 1`, (ii) `n = 4, l = 0`, (iii) `n = 3,l = 2`, (iv) `n = 3, l = 1` can be placed in order of increasing energy, from the lowest to highest, as

Options

A. `(3) lt (4) lt (2)lt (1)`
B. `(4) lt (2) lt (3)lt (1)`
C. `(2) lt (4) lt (1)lt (3)`
D. `(1) lt (3) lt (2)lt (4)`

Answer

B

Explanation

(1) 4p (2) 4s
(3) 3d (4) 3p
According to (n+1) rule, increasing order of energy `(4)lt (2) lt (3) lt (1)`.