Molecular symmetry

1. If all the atoms are reflected across the plane which perpendicular to its principal axis and the molecule having unchanged in configuration, the plane is called as ____________________________.

• Vertical reflection plane

• Diagonal reflection plane

• Horizontal reflection plane

• Dihedral reflection plane

Below is a molecule of AX₄ with different view. What is the possible axis of symmetry for this molecule?

• C₄

• C₂

• C₃

• No answer

Molecule of CH₃Cl (tetrahedral-look at the different angle) can have plane of symmetry. Which below answer is the most accurate?

• Three of vertical symmetry planes

• One of horizontal symmetry plane

• One of vertical symmetry plane

• Two of dihedral symmetry planes

All the following images (all are planar) have centre of symmetry (i) or inversion, EXCEPT?

• Image A

• Image B

• Image C

• Image D

Which of the following symmetry operation does NOT contain in the image of test tube (not planar)?

• Centre of symmetry

• C₆ rotation

• vertical sigma plane

• C₈ rotation

The given structures show the geometry of BH₃ (trigonal planar) and NH₃ (trigonal pyramidal). Which symmetry elements can be found in both BH₃ and NH₃?

• C₃ and i

• C₃ and S₃

Which of the following image has C₂ that perpendicular to its principal C_n axis?

• Image 1

• Image 2

• Image 3

• No answer

Complex of [Re₂Cl₈]²⁻ is shown below. Predict how many C₂ rotation is allowed?

• 2

• 3

• 4

• 5

Determine the point group for the following structure of n⁶-C₆Me₆

• C_6h

• C_6v

• D_6h

• D_6v

Determine the point group of the below molecule of SF₅Cl

• C_2v

• D_4v

• D_2h

• C_4v