Question

Assertion :${\left[Si{F}_6\right]}^{2-}$ is known but ${\left[Si{Cl}_6\right]}^{2-}$ not Reason: Size of flourine is small and its lone pair of electrons interact with $d$-orbitals of $Si$ strongly.

• 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 D Assertion is incorrect but Reason is correct

${\left[Si{F}_6\right]}^{2-}$ nad ${\left[Si{Cl}_6\right]}^{2-}$ are known but ${\left[C{Cl}_6\right]}^{2-}$ not.
Size of flourine is small and its lone pair of electrons interact with
$d$-orbitals of $Si$ strongly.
${\left[C{Cl}_6\right]}^{2-}$ i not known as it cannot expand its coordination number due to absence of $d$ orbitals in valence shell.
An assertion is incorrect but Reason is correct