Question

Assertion :Transition metal ion forming octahedral complexes undergo $s{p}^3{d}^2$ or $d^{2}s{p}^3$ hybridisation. Reason: Strong field ligands force the unpaired electrons of central metal ion to pair up causing $d^{2}s{p}^3$ hybridisation whereas weak field ligands do not affect electronic configuration of the metal ion undergoes in $s{p}^3{d}^2$ hybridisation.

• 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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

Transition metal ion forming octahedral complexes undergo either $s{p}^3{d}^2$ or $d^{2}s{p}^3$ hybridization.
Hence, the assertion is correct.
In presence of strong field ligands, the unpaired electrons of the metal pair up which results in $d^{2}s{p}^3$ hybridization.
In presence of weak field ligands, the unpaired electrons of the metal do not pair up which results in $s{p}^3{d}^2$ hybridization.
Thus the reason is correct. It is correct explanation of the assertion.