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Which of the following benzenoid aromatic hydrocarbons consists of isolated benzene rings?

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Which of the following benzenoid aromatic hydrocarbons consists of isolated benzene rings?
A. (1) Naphthalene
B. (2) Anthracene
C. (3) Phenanthrene
D. (4) Biphenyl
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All are polynuclear hydrocarbons. In this first three compounds, the benzene rings are fused together in the ortho positions. In biphenyl, two benzene rings are isolated
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