Glycerol, also known as glycerine, is a simple polyol with the chemical formula: \[ C_3H_8O_3. \] It contains three carbon atoms and three hydroxyl (-OH) groups, conferring high hydrophilicity and water solubility. Its structure is: \[ \text{CH}_2\text{OH} - \text{CHOH} - \text{CH}_2\text{OH}. \] Applications include its use as a food sweetener and as a key component in pharmaceutical formulations.
| Column-I (Complex compound) | Column-II ($\Delta_0$ (CFSE) $\text{cm}^{-1}$) |
| (i) $[Cr(CN)_6]^{3-}$ | (P) 17000 |
| (ii) $[Cr(H_2O)_6]^{3+}$ | (Q) 15000 |
| (iii) $[Cr(en)_3]^{3+}$ | (R) 12000 |
| (iv) $[CrF_6]^{3-}$ | (S) 20000 |