JEE Main 2021ChemistryChemical Bonding And Molecular StructureHybridization And Vsepr TheorymediumMCQ
JEE Main 2021 — Chemical Bonding And Molecular Structure Question with Solution
From: JEE Main 2021 (Online) 25th February Evening Shift
Question
Which among the following species has unequal bond lengths?
Choose an option
▸Show full solutionCorrect option: D
Correct answer
DSF4
Step-by-step explanation
(a) XeF4 is sp3d2 hybridised with 4 bond pairs and 1 lone pair and structure is square planar. Here all the bond lengths are equal.
(b) BF4−, 4 bond pair present so angle is 109o 28' and sp3 hybridised. So structure is regular tetrahedral. Here all the bond lengths are equal.
(c) SiF4
is sp3
hybridisation and regular tetrahedral geometry. Here all the bond lengths are equal.
(d) SF4 is sp3d hybridised with 4 bond pairs and 1 lone pair and its expected trigonal
bipyramidal geometry gets distorted due to presence of a lone
pair of electrons and it becomes distorted tetrahedral or
see-saw with the bond angles equal to < 120o and 179o instead of
the expected angles of 120o and 180o respectively. Here axial and equitorial both bonds are presents. And we know axial bonds are longer and weaker.
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