2. (3 pts) Determine the symmetry elements and assign the point group of: a. trans-1,2-dichloroethylene b....

Question

Question

2. (3 pts) Determine the symmetry elements and assign the point group of: a. trans-1,2-dichloroethylene b. H30+ c. formaldehy

Answer 1

Answer #1

a) trans-1,2-dichloroethylene

it contains a C2 axis perpendicular to the molecular plane through the centre of the molecule

it contains an inversion centre(i)

the molecular plane is a mirror plane

point group: C2h

b) H3O+

it contains a C3 axis through the hydrogen

it contains 3 mirror plane

point group: C3v

c)Formaldehyde

it contains a C2 axis through C-O bond

it contains two mirror plane one is the molecular plane and the other is perpendicular to it

point group: C2v

Answer 2

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