How many of following anions have `1.5` bond order ?
`IO_(4^(-)), CH_(3)COO^(-), CO_(3^(2-)), NO_(3^(-)), BrO_(2^(-)), NO_(2^(-)), HCOO^(-), SO_(3^(2-)), ClO_(2^(-)), SO_(4^(2-))` and `PO_(4^(3-))`

Answer

5

Explanation

`CH_(3)-COO^(-)`
`NO_(2^(-))`
`HCOO^(-)`
`ClO_(2)^(-)`
`BrO_(2^(-))`