The correct hond order of S—O bond in decreasing order is :–
| A. |
`OSF_2 > OSCl_2 > OSBr_2` |
 |
| B. |
`OSCl_2 > OSBr_2 > OSF_2` |
| C. |
`OSF_2 > OSBr_2 > OSCl_2` |
| D. |
`OSBr_2 > OSCl_2 > OSF_2` |
As the electronegativity of halogen attached with sulphur increases, sulphur becomes more electron deficient, and hence its tendency to get electrons from oxygen through `ppi - dpi` bonding also increases, i.e., extent of `ppi- dpi` bonding increases and hence the bond order also increases.