Question
SF6 is a well known compond but SCl6 is not known. Explain?
Solution
SF6 is a well known compound but SCl6 not this is because of the electronegtivity and the size of Chlorine.
Sulphur atom has a very small size. Therefore, six chlorine atoms can not be linked with an atom of sulphur whereas six fluorine atoms can be linked because of smaller size. Moreover, chlorine being less electronegative than fluorine can not cause the promotion of electrons in the vacant d-orbitals as effectively as done by fluorine because of its higher electronegativity.
Sulphur atom has a very small size. Therefore, six chlorine atoms can not be linked with an atom of sulphur whereas six fluorine atoms can be linked because of smaller size. Moreover, chlorine being less electronegative than fluorine can not cause the promotion of electrons in the vacant d-orbitals as effectively as done by fluorine because of its higher electronegativity.
