JEE MainChemistryChemical Bonding and Molecular Structure
The correct increasing order of the bond angles around the central oxygen atom in H₂O , F₂O and Cl₂O is :
Options
- ACl₂O < H₂O < F₂O
- BF₂O < H₂O < Cl₂O
- CF₂O < Cl₂O < H₂O
- DCl₂O < F₂O < H₂O
Correct answer
B. F₂O < H₂O < Cl₂O
Step-by-step solution
In all three molecules, the central oxygen atom is sp^3 hybridized with two lone pairs, giving a bent geometry. In F₂O , fluorine is more electronegative than oxygen. The bond pairs are pulled towards fluorine, decreasing the bond pair-bond pair repulsion near the oxygen atom. This allows the lone pairs to compress the bond angle to approximately 103^ , which is less than the 104.5^ angle in H₂O . In Cl₂O , although chlorine is electronegative, the chlorine atoms are significantly larger than both hydrogen and fluo