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In acid-catalyzed hydration of alkenes, all alkenes except ethene generally give rise to which type of alcohol product?

1. a combination of secondary and tertiary alcohols
2. a combination of primary and secondary alcohols
3. either a secondary alcohol or a tertiary alcohol
4. a primary alcohol

Correct answer: either a secondary alcohol or a tertiary alcohol

Solution

Acid-catalysed (Markovnikov) hydration puts OH on the more substituted carbon, giving a secondary or tertiary alcohol for all alkenes except ethene (which gives the primary ethanol). So the answer is 'secondary or tertiary', not 'primary and secondary'.

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