Quinone's Planar Structure and Molecular Symmetry

Steps:

• Quinone (p-benzoquinone) features a six-membered carbon ring with two opposite C=O groups and double bonds.
• All atoms are sp2 hybridized, enforcing a flat, planar geometry for conjugation.
• The molecule has a center of symmetry bisecting the C=O bonds and a plane of symmetry through the ring.
• Bond dipoles from C=O groups cancel due to symmetry, yielding zero net dipole moment.

Why D is correct:

• Quinone's symmetric, conjugated structure ensures planarity (via sp2 hybridization) and no overall dipole (dipole moments cancel per symmetry principles).

Why the others are wrong:

• A: Quinone is planar, not non-planar.
• B: Quinone lacks an overall dipole moment due to symmetry.
• C: Quinone is planar, not non-planar.

Final answer: D