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CBSE Class 12-science Answered

SF6 exist not OF6. Why?
Asked by cute44464 | 01 Mar, 2021, 01:17: PM
Expert Answer
SF6 exists but OF6 does not exist. There are two reasons for it-
 
(1) Electronegativity difference- S and F have sufficient difference in electronegativity but in OF6,  Oxygen and Fluorine have almost same electronegativity so oxygen is not able to donate enough electron to form OF6 .
 
(2)d-Orbitals and Atomic size- In SF6 - Vacant d orbitals are present so excitation of electrons is possible. In OF6 - Vacant d orbitals are not present so excitation of electron is not possible.
Small atomic size of oxygen can not accommodates six fluorine atoms.

Answered by Ravi | 02 Mar, 2021, 04:22: PM

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