Question

Which is not a hydrocarbon? (A) OC1CCCCC1 (B) c1ccccc1 (C) CC1CCCCC1C (D)

Short answer

The correct answer is (A) OC1CCCCC1 since it contains an oxygen atom, in addition to carbon and hydrogen atoms.

Step-by-step solution

Analyze each molecule

First, we need to analyze each molecule option (A), (B), (C), and (D) to determine their composition. (A) OC1CCCCC1 This molecule has an oxygen atom (O) attached to the ring. This indicates the presence of an atom other than hydrogen and carbon in the molecule. (B) c1ccccc1 This molecule is a simple six-membered carbon ring, with all carbons bonded to each other and hydrogen atoms attached to each carbon. Here, only carbon and hydrogen atoms are present. (C) CC1CCCCC1C This molecule consists of a six-membered carbon ring with two methyl groups (-CH3) attached to it. In this case, only carbon and hydrogen atoms are present. (D) CCCCCC This molecule is a linear hydrocarbon (hexane) with six carbon atoms bonded to each other and appropriate hydrogen atoms filling the bonds. Here, only carbon and hydrogen atoms are present.

Identify the non-hydrocarbon

As we have analyzed all the molecules, we can now identify which molecule is not a hydrocarbon: (A) OC1CCCCC1 is not a hydrocarbon as it contains an oxygen atom, in addition to carbon and hydrogen atoms. Therefore, the correct answer is (A).