Which one of the following statements is <strong>NOT</strong> correct for benzene?

  1. A. Each carbon atom forms sigma bonds with two other carbon atoms with a bond angle of 120^\circ.
  2. B. Delocalized electrons create a symmetrical 'cloud' of electrons above and below the plane.
  3. C. The length of C-C bonds is intermediate between single and double bonds.
  4. D. It has six isomers.

Correct Answer: D. It has six isomers.

Explanation

Benzene (C_6H_6) does not have six isomers. It is a highly symmetrical cyclic planar molecule whose actual structure is a resonance hybrid.

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