Quiz-symmetry

Among below, which symmetry element will decide whether a molecule is optically active or not?

• C_n  (n>1)

• S_n  (n>1)

• σ

• i

Symmetry point group of allene (H₂C=C=CH₂)

• C_2v

• D_2h

• D_2d

• C_s

The symmetry point groups of ortho & meta- dichlorobenzenes respectively are:

• C_2v  , C_3v

• C_2v  , C_2v          

• C_2v  , D_2h       

• D_2h , D_2h

The highest order subgroup of D2h

• C2

• Cs

• C2h

• Ci

Check the validity of the below statements: (a) A molecule that has no improper rotation axis is dissymmetric (b) A molecule containing asymmetric center lacks any symmetry

• (a) true, (b) false

• (a) false (b) true

• (a) false (b) false

• (a) true (b) true

A point group that can be possessed by an optically active molecule

• D2h

• C3v

• C2h

• C2

Which molecule possess the highest symmetry?

• Methane

• Butane

• Ethane

• Ethylene

Which of the following pairs of operations commute each other?

• C2(x) and C2(y)

• C2(x) and i

• C2(x) and σv

• All of the above

Which of the below pairs represent a set of characteristic operations?

• S₆¹ and S₆⁶

• S₆¹ and S₆⁵

• S₆² and S₆³

• S₆³ and S₆⁴

Symmetry point group of fullerene

• Oh

• O

• Td

• I_h