Question

Assertion :$S{F}_6$ exists but $S{H}_6$ does not. Reason: $d\pi -p\pi$ bonding cannot take place in $S{H}_6$

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Assertion is incorrect but Reason is correct

Answer 1

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

Sulfur hexafluoride, taking a basis set of the one sulfur 3s-orbital, the three sulfur 3p-orbitals, and six octahedral geometry symmetry-adapted linear combinations of fluorine orbitals, a total of ten molecular orbitals are obtained, providing room for all $12$ valence electrons. This is a stable configuration only for $S{X}_6$ molecules containing electronegative ligand atoms like fluorine, which explains why $S{H}_6$ doesn't form.