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How many moles of HI are required to completely react with one mole of the following compound: a benzene ring bearing four substituents — an allyl group (CH2=CH-CH2-), a 2-hydroxyethyl group (CH2CH2OH), a hydroxyl group (OH), and a methoxy group (OCH3)?
- 1
- 2
- 3
- 4
Correct answer: 4
Solution
The compound has four HI-reactive sites: (1) the allyl C=C double bond, (2) the primary alcohol CH2CH2OH, (3) the phenolic OH, and (4) the aryl methyl ether OCH3. Each consumes exactly one mole of HI, giving a total of 4 moles.
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