EasyChemistryHigh School (9–10)GeneralCarbon and Its Compounds › Hydrocarbons and NomenclatureConceptualBoard Exam
Write the structural formula of each, showing every bond to carbon…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Write the structural formula of each, showing every bond to carbon.
- Butanoic acid. (b) Propene. (c) Ethanal.
Need a reminder? The key ideaShow
Stem for the carbons in the chain: meth 1, eth 2, prop 3, but 4, pent 5, hex 6. Ending for the group: -ane, -ene, -yne, -ol (alcohol, ), -al (aldehyde, ), -one (ketone, C=O inside), -oic acid (). Prefix for a halogen: chloro, bromo.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) . The last carbon has a double bond to one oxygen and a single bond to the .
Step 2. (b) .
Step 3. (c) : the second carbon has a hydrogen and a double bond to oxygen.
Check. Count four bonds on every carbon.
Answer: as drawn in steps 1 to 3.
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