Which one of the following represents the INCORRECT decreasing order of bond angles ?

Options

A. `CO_(2) gt BF_(3) gt CH_(4) gt H_(2)O`
B. `NO_(2)^(+) gt NO_(2) gt NO_(2)^(-)`
C. `BCl_(3) gt PCl_(3) gt AsCl_(3) gt BiCl_(3)`
D. `IO_(3)^(-) gt BrO_(3)^(-) gt ClO_(3)^(-)`

Answer

4

Explanation

In chlorides of group `15^(th)` elements, the central atoms have `sp^(3)` hybridisation and thus have pyramidal shapes with one lone pair of electrons. The bond angle decreases down the group with decreasing electronegativity.

`(4)` The bond angle decrease with decrease in electronegativities and increase in size of central atom. Hence the correct order `O-X-O` bond angle is `CIO_(3)^(-) gt BrO_(3)^(-) gt IO_(3)^(-)`
`{:(,,X-O,,O-X-O),(,,(p m),,("Angle")),(ClO_(3)^(-),,149,,107^(@)),(BrO_(3)^(-),,165,,104^(@)),(IO_(3)^(-),,181,,100^(@)):}`