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SingaporeChemistryQuick questions
Organic Chemistry
Quick questions on Hydroxy compounds, alcohols and phenols: Singapore A-Level H2 Chemistry
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is the tri-iodomethane (iodoform) test?Show answer
Warming with iodine and sodium hydroxide gives a pale yellow precipitate of tri-iodomethane () for compounds containing the group (or the group). So ethanol and propan-2-ol give a positive test, but methanol and propan-1-ol do not. This pinpoints a methyl-carbinol structure.
What is phenol?Show answer
Phenol is a stronger acid than ethanol. When phenol loses , the resulting phenoxide ion is stabilised because the negative charge on oxygen is delocalised into the benzene ring. The ethoxide ion from ethanol has no such delocalisation, so its charge is concentrated. The greater stability of the phenoxide ion means phenol gives up more readily.
What is q1?Show answer
State the product and conditions when propan-1-ol is oxidised to a carboxylic acid. [2 marks]
What is q2?Show answer
Explain why phenol reacts with bromine water without a catalyst but benzene does not. [2 marks]
What is q3?Show answer
Name the organic product of dehydrating butan-2-ol, and the conditions. [2 marks]
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