Question

In which of the following molecules all atoms are coplanar:

• A.
• B.
• C.
• D.

Answer 1

The correct option is B

All the carbons in the benzene are $s{p}^2$ hybridised. Hence, all atoms will be coplanar in this molecule.In option B:
In option C:
In option D: All the carbon atoms are $s{p}^3$ hybridised.
Hence, the correct answer is option A.