Which of the following is not true regarding the structure of benzene? a) the carbon-carbon bonds rapidly alternate between single and double bonds. b) the c-c-c bond angles are 120°. c) the hydrogen atoms are equivalent. d) the π bonds are completely conjugated.

a) The carbon-carbon bonds rapidly alternate between single and double bonds.

Explanation:

In benzene we have that the molecule is planar with an sp² hybridization that allow for three π bonds and the carbons atoms are also bonded together via sigma  a sp² hibridization as well as one hydrogen atom. The alternation of or conjugation of the π bond allow the delocalization of these electron along the whole ring.

Therefore, a) is false the carbon-carbon bonds rapidly alternate between single and double bond. The electrons in the π bonds are completely delocalized through the six atoms in the ring.

b) is true since we have a sp² hybridization.

c) and d) are true for the reasons given previously.

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