Increasing order of crystal field splitting power of following ligands will be:

(A) $CN^-$
(B) $Cl^-$
(C) $F^-$
(D) $H_2O$

Choose the correct answer from the options given below:

(B) < (C) < (D) < (A)

The correct answer is Option (4) → (B) < (C) < (D) < (A)

Crystal Field Splitting Power of ligands follows the spectrochemical series, which orders ligands from weak field (low splitting) to strong field (high splitting).

Here’s the relevant portion of the spectrochemical series (in increasing order of crystal field splitting):

Cl⁻ < F⁻ < H₂O < CN⁻

So, from weakest to strongest field ligand:

• (B) Cl⁻

• (C) F⁻

• (D) H₂O

• (A) CN⁻

Thus, the increasing order of crystal field splitting power is:(B) < (C) < (D) < (A)