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Problems and exercisesDienes and Alkynes

1. Isolated, conjugated or cumulated?

Classify these dienes:

  1. CH2=CH–CH=CH–CH3
  2. CH2=C=CH–CH3
  3. CH2=CH–CH2–CH2–CH=CH2
  4. 1,3-Cyclohexadiene
  5. 1,4-Cyclohexadiene

2. Isomeric dienes and alkynes

1,3-Butadiene and 1-butyne have the same molecular formula, C4H6. How would you tell them apart with a simple chemical reagent?

3. Degrees of unsaturation

How many degrees of unsaturation does C5H6 have? Propose a structure containing a conjugated diene and another containing a triple bond.

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