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AIIMS 2005
Exam
AIIMS
Year
2005
Subject
Chemistry
Chapter
Chemical Bonding and Molecular Structure

AIIMS 2005 · Chemistry · Chemical Bonding and Molecular Structure

Assertion : SeCl_4 does not have a tetrahedral structure. Reason :...

Assertion : SeCl4\mathrm{SeCl}_4 does not have a tetrahedral structure. Reason : Se\mathrm{Se} in SeCl4\mathrm{SeCl}_4 has two lone pairs.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion
  3. CIf assertion is true but reason is false
  4. DIf both assertion and reason are false.

Correct answer

C. If assertion is true but reason is false

Step-by-step solution

SeCl4\mathrm{SeCl}_4 possess see saw geometry, which can be regarded as a distorted trigonal bipyramidal structure, having one lone pair (lp) of electrons in the basal position of the trigonal bipyramidal. Seesaw geometry of SeCl4\mathrm{SeCl}_4 molecules arises due to the sp3ds p^3 d hybridisation of the central atom. The distortion in shape is due to the presence of one lone pair of electrons.
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