Question detail
Which pair correctly compares propene with propane?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Reactions of alkenes and alcohols (chemistry only)
Question
- A. Propene is C3H6 and propane is C3H8
- B. Propene is C3H8 and propane is C3H6
- C. Both are C3H8
- D. Both contain oxygen
Answer
The correct option is Propene is C3H6 and propane is C3H8. Propene is C3H6, while the corresponding alkane propane is C3H8.
Explanation
The correct option is Propene is C3H6 and propane is C3H8. For three carbon atoms, the alkene formula CnH2n gives C3H6 and the alkane formula CnH2n+2 gives C3H8. Propene therefore has two fewer hydrogens than propane. Neither formula contains oxygen.
Common mistake
Understanding Unsaturation
Students often state that alkenes are unsaturated because they have a double bond, without mentioning the hydrogen atom difference.
Emphasize that alkenes are unsaturated specifically because they contain two fewer hydrogen atoms than the corresponding alkane.
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