Question

Compound Lewis Structure Total Valence Electrons Electron Pair SO Molecular Geometry Approximate Polar? Geometry Bond Angles 24 trigona! planar trigonal planar HCN H-CEN SO2 CS2 1- C-H tethredral tethredral -

Answer 1

we will do each compound step by step and lewis structure is in photograph

Electronic pair geometry is found by finding the value of Z

Z = total sigma bond formed by central atom + lone pair present on central atom

if Z = 2 , electronic pair geometry is linear

if Z = 3 , electronic pair geometry is trigonal planar

if Z = 4 , electronic pair geometry is tetrahedral

if Z = 5 , electronic pair geometry is pentagonal bipyramidal

if Z = 6 , electronic pair geometry is octahedral

Molecular geometry depends upon the lone pair present,if no lone pair is present,electronic geometry is same as molecular geometry

a) SO₃

Total valence electrons - both S and O have 6 electrons in valence shell = 6 +3 x 6 =24

electronic pair geometry - Trigonal planar ( Z=3)

Molecular geometry - Trigonal Planar ( since lone pair is not present)

Approximate bond angles - 120

Polarity - non polar

b) HCN

Total valence electrons - H,C,N have 1,4,5 electrons in valence shell respectively = 1+4+5 =10

electronic pair geometry - Linear ( Z=2)

Molecular geometry - Linear ( since lone pair is not present)

Approximate bond angles - 180

Polarity - polar

c) SO₂

Total valence electrons - S,O have 6,6 electrons in valence shell respectively = 6+ 2x6 = 18

electronic pair geometry - trigonal planar ( Z=3)

Molecular geometry - bent ( since one lone pair is present)

Approximate bond angles - 118

Polarity - polar

d) CS₂

Total valence electrons - S,C have 6,4 electrons in valence shell respectively = 6x2 +4 = 16

electronic pair geometry - Linear ( Z=2)

Molecular geometry - Linear ( since lone pair is not present)

Approximate bond angles - 180

Polarity - non polar

a) CH₄

Total valence electrons - H,C have 1,4, electrons in valence shell respectively = 1x4+4 = 8

electronic pair geometry - Tetrahedral ( Z=4)

Molecular geometry - Tetrahedral ( since lone pair is not present)

Approximate bond angles - 109.5

Polarity - non polar

Shapes: HEN est Š: CHy