Question

Which of the following is correct for A and B?

• A. Both A and B are chiral
• B. Only B is chiral
• C. Only A is chiral
• D. Neither A nor B is chiral

Answer 1

The correct option is B Only B is chiral

In order for a molecule to be chiral, it must not be superimposable on its mirror image. Molecules with a plane of symmetry or a center of symmetry do not meet this criterion. Molecule 'A' has a plane of symmetry but molecule 'B' has no symmetry.
Also, all the carbons are $s{p}^2$ hybridised in 'A'. So, it is planar and achiral.
Therefore, only compound 'B' is chiral.


Hence, (b) is correct.