Which of the following undergoes disproportionation?

Options

A. `SCl_(2)`
B. `SF_(4)`
C. `S_(2)F_(10)`
D. `S_(2)Cl_(2)`

Answer

4

Explanation

All group `16` element except `Se` from difluorides ,chlorides and bromides.These diahalides form angular molecules based on a tetrajedron(`sp^(3)` hybridisation) with two positives occupied by lone pairs

The lone pairs distort the tetrahedral angle of `109.5^(@)` to `103^(@)` in `SCl_(2), 101.5^(@)` in `F_(2)O` and `98^(@)` in `TeBr_(2)`
The well know mohohalides are dimeric in nature .Diameric monohalides such as `S_(2)F_(2), S_(2)Cl_(2), S_(2)Br_(2), Se_(2)Cl_(2)` and `Se_(2) Br_(2)` are formed by direct action between `S` and `Se` and the halogens. these monohalides are hydrolysed slowly and tend to disproportionate:
`2S_(2)F_(2)+2H_(2)O rarr4HF+SO_(2)+3S`
`2Se_(2)Cl_(2)rarrSeCl_(4)+3Se`
Note that heating `S` and `Cl_(2)` gives `S_(2)Cl_(2)` and if this saturated wiht chlorine`SCl_(2)` is formed.
`SF_(4)`involving `sp^(3)d` hybridisation of `S`,has trigonal bipyamidal geometry in which one of the equatorial positions is occupied by a lone pair of electrons. This leads to see law -saw shaped.
The compound `S_(2)F_(10)`has an unusual shape consisting of two octahedra joined together.