Multiple choice

Among the following aromatic hydrocarbons which one is a known human carcinogen?

  1. Naphthalene

  2. Anthracene

  3. Phenanthrene

  4. Benzo[a]pyrene
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D Correct answer
Explanation

It has five rings. It also has the faint aromatic odour. Pure benzo[a]pyrene is pale yellow, and is found as monoclinic or orthorhombic crystals. These can be separated from a mixture of polynuclear aromatic hydrocarbons using various standard separation techniques and recrystallized from benzene and methanol. It is known as human carcinogen.

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