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Q.
Assertion : $SeCl_4$ does not have a tetrahedral structure. Reason : $Se$ in $SeCl_4$ has two lone pairs.
AIIMSAIIMS 2008Chemical Bonding and Molecular Structure
Solution:
$SeCl_4$ possesses see-saw geometry, which can be regarded as a distorted trigonal bipyramidal structure, having one lone pair of electrons in the basal position of the trigonal bipyramid. See-saw geometry of $SeCl_4$ molecules arises due to the $sp^{3} d$ hybridisation of the central atom. The distortion in shape is due to the presence of one lone pair of electrons.