• Group Theory and Molecular Symmetry
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Group Theory and Molecular Symmetry

Description: Chemistry Group theory Molecular symmetry Point group GATE IIT JEE CSIR NET Chemical Sciences Symmetry elements Physical ChemistryChemistry
Number of Questions: 15
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Tags: Chemistry Group theory Molecular symmetry Point group GATE IIT JEE CSIR NET Chemical Sciences Symmetry elements Physical Chemistry
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Point group in cis-platin is ____________.

  1. C4v

  2. C2v

  3. D2h

  4. D4h

  5. C3v

Show answer
Correct Option: B
Explanation:

Correct option: One C2 axis and two vertical planes. Hence, point group is C2v.

Point group of trans-1, 2-dichloroethene is __________.

  1. C2v

  2. C2h

  3. D2h

  4. D2d

  5. D2

Show answer
Correct Option: B
Explanation:

Correct option: C2 axis and horizontal plane. Hence, point group must be C2h.

Which of the following molecules is an example of C∞v point group?

  1. HCN

  2. CCl4

  3. NH3

  4. BCl3

  5. CH2Cl2

Show answer
Correct Option: A
Explanation:

Correct option. C∞ is the principal axis in linear HCN molecule with infinite number of vertical planes and no horizontal plane. Hence, it is an example of C∞v point group.

Which of the following is not an example of D∞h point group?

  1. H2

  2. HCl

  3. CO2

  4. N2

  5. C2H2

Show answer
Correct Option: B
Explanation:

Correct option: HCl is unsymmetrical linear molecule. It has no horizontal plane. So, this point group is not possible. HCl is an example of C∞v point group.

Which of the following molecules is an example of Cs point group?

  1. CO2

  2. HCl

  3. CH2BrCl

  4. CHCl3

  5. CH4

Show answer
Correct Option: C
Explanation:

Correct option. This point group contains only two symmetry operations: E (the identity operation) and σ (a mirror plane). An example of Cs point group is CH2BrCl.

Point group of trigonal bi-pyramidal AB5 type molecule is __________.

  1. C3v

  2. C5v

  3. D3h

  4. D3

  5. D5h

Show answer
Correct Option: C
Explanation:

Correct option. One C3, three C2’s perpendicular to C3 and one horizontal plane. Hence, point group is D3h.

Point group in beryllium difluoride is _________.

  1. C∞v

  2. D∞v

  3. D∞

  4. D∞h

  5. C∞

Show answer
Correct Option: D
Explanation:

Correct option: C∞ & infinite number of C2 axes with horizontal plane. Hence, point group must be D∞h.

D2h point group means ____________.

  1. 2 C2's and 1 horizontal plane

  2. 2 C2's and 2 horizontal planes

  3. 1 C2 and 1 horizontal plane

  4. 1 C2, 2 C2's perpendicular to C2 and 1 horizontal plane

  5. 1 C2, 1 C2 perpendicular to C2 and 1 horizontal plane

Show answer
Correct Option: D
Explanation:

Correct option: 1 C2, 2 C2's perpendicular to C2 and 1 horizontal plane are required for point group to be D2h.

Which of the following molecule(s) belong to D∞h point group?

  1. CO
  2. HCN
  3. CO2
  4. O2

  1. 1 and 2

  2. 1 and 3

  3. 2 and 3

  4. 2 and 4

  5. 3 and 4

Show answer
Correct Option: E
Explanation:

CO2 and O2 belong to D∞h point group.

Which of the following statements is not correct about trans-C2H2Cl2?

  1. It has one C2 symmetry element.

  2. Structure of this molecule is non planar.

  3. Two chlorine atoms are opposite to each other.

  4. It has one horizontal plane.

  5. Point group of this molecule is C2h.

Show answer
Correct Option: B
Explanation:

Correct option. Trans-C2H2Cl2 molecule is planar due to sp2 hybridisation.

Point group of allene (CH2=C=CH2) is ___________.

  1. D2h

  2. D2d

  3. C2v

  4. D∞h

  5. C∞v

Show answer
Correct Option: B
Explanation:

Correct option. It has one C2, two C2’s perpendicular to C2 and dihedral planes also, so D2d point group.

Which of the following statements is not true about BF3 molecule?

  1. The structure is trigonal planar.

  2. The principal axis of rotation is C3.

  3. It has one vertical plane of symmetry.

  4. It has one horizontal plane of symmetry.

  5. It has three C2 elements of symmetry.

Show answer
Correct Option: C
Explanation:

There are 3 vertical planes in BF3 molecule.

Which of the following is true about the structure of C2H2 molecule?

  1. Infinite number of vertical planes

  2. Infinite number of horizontal planes

  3. Non-linear structure

  4. C4 principal axis of rotation

  5. Two horizontal planes of symmetry

Show answer
Correct Option: A
Explanation:

Correct option. C2H2 is a symmetrical linear molecule. So, infinite number of vertical planes are there.

Which of the following molecules is an example of C1 point group?

  1. CH4

  2. CHCl3

  3. CH2ClBr

  4. CHFClBr

  5. CCl4

Show answer
Correct Option: D
Explanation:

CHFClBr belongs to C1 point group.

Which of the following matches of point group : example is incorrect?

  1. C2v : H2O2

  2. D3h : BF3

  3. C3h : B(OH)3

  4. D4d : S8

  5. Oh : SF6

Show answer
Correct Option: A
Explanation:

H2O2 belongs to C2 point group.

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