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Compound (a) is cyclohexane with an -OH group directly attached to the ring, and compound (b) is cyclohexane with a -CH2CH2OH side chain. Which statement correctly describes these compounds?

1. (a) is phenol while (b) is alcohol
2. Both (a) and (b) are primary alcohol
3. (a) is primary and (b) is secondary alcohol
4. (a) is secondary and (b) is primary alcohol

Correct answer: (a) is secondary and (b) is primary alcohol

Solution

Compound (a) is cyclohexanol — the carbon bearing -OH is attached to two ring carbons, making it a secondary alcohol. Compound (b) has -OH on the end of a two-carbon chain, which is a primary carbon (attached to only one other carbon), making it a primary alcohol.

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