When a hydrocarbon undergoes combustion in O2, what are the products?
  1. CH4 and H2O
  2. CO2 and H2O
  3. CH4 and CO2
  4. C2H2 and CO2
  5. C2H2 and CH4
Explanation
Answer: CO2 and H2O

The products of a hydrocarbon undergoing combustion in O2 are always CO2 and H2O. Memorize this general outline for a reaction; you will see it often.
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