Group Theory (Axis of Symmetry) MCQ Questions for CSIR NET & GATE

This article contains MCQ Questions on Chemistry chapter "Group Theory" topic "Symmetry Elements". 

Group Theory Assignment 1

Q1. The principal axis present in norbornane is:

1. C₂ 
2. C₃
3. C₆  
4. C_∞

Q2.Conversion of boron trifluoride to tetrafluoroborate ion accompanies:

1. Increase in symmetry and bond elongation
2. Increase in symmetry and bond contraction
3. Decrease in symmetry and bond contraction
4. Decrease in symmetry and bond elongation

Q3. Which of the following statement is incorrect regard a chiral molecule.

1. It has superimposable mirror image
2. lack of center of symmetry
3. lack of alternate axis of symmetry
4. All of the above

Q4. Which of the following does not contain C₃ axis?

1. POCl₃ 
2. [NH₄]⁺
3. [H₃O]⁺ 
4. ClF₃

Q5. Which of the following species posses both C₃ and C₂ axis?

1. SO₃ 
2. NH₃
3. PCl₃ 
4. [H₃O]⁺

Q6. Which of the following molecule or ions possessed a C₄ principal axis?

1. XeF₄ 
2. CF₄
3. S₄ 
4. (PF₄)⁺

Q7. What is the principle axis in H₂O molecule

1. C₂ 
2. C3
3. C₄ 
4. None

Q8. The symmeTry group is C₂, for the molecule/ion

1. H₂O 
2. H₂O₂
3. SO₂ 
4. NO₂

Q9. According  to  rules  of  symmetry  there  is  only  one principal axis and many subsidiary axis present in a molecule, the principal axis is one which is:

1. Parallel to Horizontal Plane
2. Perpendicular to vertical plane
3. Perpendicular  to  Horizontal  Plane  and  is  of lowest order
4. Perpendicular  to  Horizontal  Plane  and  is  of Highest order

Q10. Which of the following molecules or object has nC₂ rotational axis perpendicular to the highest order C_n rotational axis? [MSQ]

1. A
2. B
3. C
4. None

Q11. Which of the following molecule or object contains a C₄ rotational axis? [MSQ]

1. A
2. B
3. C
4. D

Group Theory Assignment 1 - Answers & Solutions

1. (1)
2. (1)
3. (1)
4. (4)
5. (1)
6. (1)
7. (1)
8. (2)
9. (4)
10. (1, 2, 3)
11. (1, 3, 4)
12. (1)

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