(C) In $SeCl_4$,the central atom $Se$ has $6$ valence electrons. It forms $4$ bonds with $Cl$ atoms and has $1$ lone pair of electrons. Thus,the total

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(C) In $SeCl_4$,the central atom $Se$ has $6$ valence electrons. It forms $4$ bonds with $Cl$ atoms and has $1$ lone pair of electrons. Thus,the total number of electron pairs is $4 + 1 = 5$,which corresponds to $sp^3d$ hybridization. Due to the presence of one lone pair,the geometry is a see-saw shape,not tetrahedral. Therefore,the Assertion is correct,but the Reason is incorrect because $Se$ has only one lone pair,not two.

Class 11 Chemistry Chemical Bonding and Molecular Structure VSEPR Theory

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Assertion : $SeCl_4$ does not have a tetrahedral structure.
Reason : $Se$ in $SeCl_4$ has two lone pairs.

AIIMS 2005 All AIIMS

A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
C
If the Assertion is correct but Reason is incorrect.
D
If both the Assertion and Reason are incorrect.

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Chemical Bonding and Molecular Structure

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VSEPR Theory

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Assertion : $SeCl_4$ does not have a tetrahedral structure.Reason : $Se$ in $SeCl_4$ has two lone pairs.

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Assertion : $SeCl_4$ does not have a tetrahedral structure.
Reason : $Se$ in $SeCl_4$ has two lone pairs.