Multiple choice

Which of the following is a natural constituent of crude oil?

  1. Benzene

  2. Pyridine

  3. Sulphapyridine

  4. Carbon disulfide
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A Correct answer
Explanation

Benzene is a natural constituent of crude oil, and is one of the most basic petrochemicals. Benzene is an aromatic hydrocarbon and the second [n]-annulene ([6]-annulene), a cyclic hydrocarbon with a continuous pi bond. It is also related to the functional group of aromatic hydrocarbons (arene) which is a generalized structure of benzene.

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