JEE Main 2025 Apr 8 Shift 2, Chemistry Q16: Valence Bond Theory And Hybridisation

JEE Main2025Apr 8, Shift 2Chemistry

Q.

The number of species from the following that are involved in sp $^{3}$ d $^{2}$ hybridization is:

$[C o (N H_{3})_{6}]^{3 +}$ , $S F_{6}$ , $[C r F_{6}]^{3 -}$ , $[C o F_{6}]^{3 -}$ , $[M n (C N)_{6}]^{3 -}$ and $[M n C l_{6}]^{3 -}$

A
5
B
6
C
4
D
3

Solution

Step 1: Determine the Hybridization

Species	Metal ion / Central atom	Hybridization
$[C o (N H_{3})_{6}]^{3 +}$	$C o^{3 +}$ ( $d^{6}$ ), $N H_{3}$ is strong field	$d^{2} s p^{3}$
$S F_{6}$	S	$s p^{3} d^{2}$
$[C r F_{6}]^{3 -}$	$C r^{3 +}$ ( $d^{3}$ )	$d^{2} s p^{3}$
$[C o F_{6}]^{3 -}$	$C o^{3 +}$ ( $d^{6}$ ), $F^{-}$ is weak field	$s p^{3} d^{2}$
$[M n (C N)_{6}]^{3 -}$	$M n^{3 +}$ ( $d^{4}$ ), $C N^{-}$ is strong field	$d^{2} s p^{3}$
$[M n C l_{6}]^{3 -}$	$M n^{3 +}$ ( $d^{4}$ ), $C l^{-}$ is weak field	$s p^{3} d^{2}$

Step 2: Count the Species with $s p^{3} d^{2}$ Hybridization

The species having $s p^{3} d^{2}$ hybridization are:

$S F_{6}$
$[C o F_{6}]^{3 -}$
$[M n C l_{6}]^{3 -}$

Conclusion

Number of species with $s p^{3} d^{2}$ hybridization $= 3$ .

$Correct Answer: 3$

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