Question

The M - O - M bond angles in M₂O (where M is halogen) is in the order 

(a) Br₂O > CI₂O > F₂O 

(b) F₂O > Br₂O > Cl₂O 

(c) F₂O > CI₂O > Br₂O 

(d) Cl₂O > F₂O > Br₂O

Answer 1

The correct option is (a) Br₂O > CI₂O > F₂O.

Explanation:

In OF₂ repulsion between lone pairs is greater than that between bond pair since electrons are away from O and nearer to F. tn Cl₂O, bonding electrons are nearer to O than to Cl, so the bond angle is greater than 109^o28'. In Br₂O, the bonding electrons are more closer to oxygen than in Cl₂O, so the bond angle is largest (116^o).