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NSWChemistryQuick questions
Module 7: Organic Chemistry
Quick questions on Aldehydes, ketones and carboxylic acids explained: HSC Chemistry Module 7
6short 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 are the three functional groups?Show answer
All three contain a carbonyl group . They differ in what else is attached to the carbonyl carbon.
What is tests that distinguish aldehyde from ketone?Show answer
Tollens' reagent (silver mirror test). in alkaline solution. Warm gently in a clean glass test tube.
What are reactions of carboxylic acids?Show answer
Carboxylic acids are weak acids ( about 4 to 5). They ionise partially in water:
What is q1?Show answer
Write structural formulae for butanal, butan-2-one and butanoic acid, and identify which can be distinguished by Tollens' reagent. [3 marks]
What is q2?Show answer
A 1.50 g sample of butanoic acid is titrated with 0.250 mol L NaOH. Calculate the volume of NaOH required for complete neutralisation. [3 marks]
What is q3?Show answer
A student is given three unknowns A, B and C in unlabelled bottles. A gives a silver mirror with Tollens', B effervesces with sodium hydrogen carbonate, C gives neither reaction. (a) Classify each compound.
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