Chemistry organic Unit 4

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1. How can an Aldehyde be prepared from an alcohol ?

  • Oxidation of a primary alcohol and immediately distill
  • Reflux of a primary alcohol
  • Oxidation of a secondary alcohol
  • Reduction of tertiary alcohol
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2. What test doesn't distinguish between a Ketone or aldehyde

  • Benedict Solution - brick red precipitate
  • Fehlings solution - brick red precipitate
  • Brady's reagent - yellow / orange precipitate
  • Tollens solution - silver mirror

3. Which statement is false about optical isomerism ?

  • Enantiomers rotate plane polarised light in opposite directions
  • A racemic mixture is always produced
  • The Molecule must have a chiral center

4. What is the general formula for an aldehyde ?

  • C(n) H(n+1)CHO
  • C(n) H(2n+1)CHO
  • C(n) H(2n+1)CO
  • C(n) H(2n)CHO

5. What is the observations of the Iodoform reaction ?

  • orange / red precipitate
  • Silver mirror
  • Pale yellow precipitate
  • yellow solution
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