JEE Advanced · Chemistry · 13. GOC
The correct statement(s) about the compound given below is are
- A the compound is optically active
- B the compound possesses centre of symmetry
- C the compound possesses plane of symmetry
- D the compound possesses axis of symmetry
Answer & Solution
Correct Answer
(B) the compound possesses centre of symmetry
Step-by-step Solution
Detailed explanation
The compound does not possess centre of symmetry and plane of symmetry but possesses the proper axis of symmetry \(\left(C_n\right)\). A \(C_n\) axis of symmetry is an axis about which the molecule can be rotated by \(360^{\circ} / n\) and thereby produce a molecule indistinguishable from the original molecule.
From this face \(\mathrm{H}\) (on right) and \(\mathrm{Cl}\) (on left) are facing towards us and again on rotating at \(180^{\circ} \mathrm{C}-2\) comes at \(\mathrm{C}-1\) place and again \(\mathrm{H}\) (on right) and \(\mathrm{Cl}\) (on left) are facing. We get an indistinguishable form on \(180^{\circ}\) rotation, so it has a proper axis of symmetry \(\left(C_2\right)\).
If a molecule is not superimposable on its mirror image, that molecule can exhibit optical activity, if these have proper axis but no improper axis or if a \(C_n\) axis be the only symmetry element present in a molecule, that molecule is optically active.
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