Advertisements
Advertisements
Question
Explain VSEPR theory. Applying this theory to predict the shapes of IF7 and SF6.
Advertisements
Solution
Lewis’s concept of the structure of molecules deals with the relative position of atoms in the molecules and sharing of electron pairs between them. However, we cannot predict the shape of the molecule using Lewis concept. Lewis theory in combination with VSEPR theory will be useful in predicting the shape of molecules.
IF7:
Iodine has 7 valence electrons in the valence shell. In an excited state it has 6 valency electrons by 1st and 2nd excited state & under sp3d2, hybridization and combines with 7 Fluorine to get pentagonal bipyramidal shape. There are no lone pairs.
I = ns2 np5 nd0
pentagonal bipyramidal
SF6:
Sulphar attain six valence electron in 1st and 2nd excited states undergoes sp3d2 hybridization and combines with six ‘F’ atoms, as there no lone pair electrons it geometry in octahedral.
S = 16 = ns2 np4 nd0
Octahedral
APPEARS IN
RELATED QUESTIONS
Discuss the shape of the following molecules using the VSEPR model:
BeCl2, BCl3, SiCl4, AsF5, H2S, PH3
The H-N-H bond angle in NH3 molecule is ____________.
Elements \[\ce{X, Y}\] and \[\ce{Z}\] have 4, 5 and 7 valence electrons respectively. Which of these compounds will have the highest dipole moment?
The number of lone pairs of electrons on the central I atom in `"I"_3^-` is ______.
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: The H-O-H bond angle in water molecule is 104.5°.
Reason R: The lone pair-lone pair repulsion of electrons is higher than the bond pair-bond pair repulsion.
In the light of the above statements, choose the correct answer from the options given below:
Identify compound having square pyramidal-shape:from following.
Identify the geometry of TeF4 molecule from the following.
Match List-I with List-II.
| List-I | List-II | ||
| A. | XeO3 | I. | sp3d; linear |
| B. | XeF2 | II. | sp3; pyramidal |
| C. | XeOF4 | III. | sp3d3; distorted octahedral |
| D. | XeF6 | IV. | sp3d2; square pyramidal |
Choose the correct answer from the options given below:
Match List-I with List-II:
| List-I (Compound) |
List-II (Shape/Geometry) |
| A. NH3 | I. Trigonal pyramidal |
| B. BrF5 | II. Square planar |
| C. XeF4 | III. Octahedral |
| D. SF6 | IV. Square pyramidal |
Choose the correct answer from the options given below:
In XeF2, XeF4, XeF6 the number of lone pairs on Xe are respectively ______.
