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Consider the following substances : 1....

Consider the following substances :
1. `OF_(2)` 2. `Cl_(2)O` 3. `Br_(2)O`
The correct sequence X - O - X bond angle is

A

`1gt2gt3`

B

`2gt1gt3`

C

`1gt3gt2`

D

`3gt2gt1`

Text Solution

Verified by Experts

The correct Answer is:
D
Bond angles are distorted on account of the lone pairs. The bonding electrons in `"OF"_(2)` are nearer the F atom, because of its higher electronegativity. Hence, the repulsion between the lone pairs exceeds the bonded pairs. Consequently, the F-O-F bond angles is less than the tetrahedral angle of `109^(@)28'`. In `"Cl"_(2)"O"`, the bonding pairs of electrons are closer to oxygen, because of its greater electronegativity.
Hence, in this case repulsion between the bonded pair of electrons exceeds the lone pairs. Hence, the bond angle is greater than `109^(@)28'` and is found to be equal to `111^(@)`. By similar reasoning, the bond angle in `"Br"_(2)"O"` is expected to be greater than `111^(@)`. In `"Cl"_(2)"O"` and `"Br"_(2)"O"`, the bond angles are also increased, because of steric crowding of larger halogen atoms.
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