A quick introductory look at the alcohols
4 marks · NormalThe table below gives the molecular formula of several organic compounds. Complete the table by stating whether each compound is an alcohol and, if so, writing its functional group.
| Compound | Molecular formula | Alcohol (Yes/No)? | Functional group (if any) |
|---|---|---|---|
| Methanol | CH3OH | ||
| Ethanoic acid | CH3COOH | ||
| Propanol | C3H7OH | ||
| Propene | C3H6 |
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
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Also accept: –OH; hydroxyl group
Common mistakes: Confusing carboxyl and hydroxyl groups; Assuming all compounds with oxygen are alcohols
Show mark scheme and worked solution
Marking points
B1 · 1 mark · Correctly identifies methanol as alcohol with –OH group
B2 · 1 mark · Correctly identifies ethanoic acid as NOT an alcohol; no functional group to be written (or gives –COOH/carboxyl if filled).
B3 · 1 mark · Correctly identifies propanol as alcohol with –OH group.
B4 · 1 mark · Correctly identifies propene as NOT an alcohol.
Worked solution
| Compound | Molecular formula | Alcohol (Yes/No)? | Functional group (if any) |
|---|---|---|---|
| Methanol | CH3OH | Yes | –OH |
| Ethanoic acid | CH3COOH | No | |
| Propanol | C3H7OH | Yes | –OH |
| Propene | C3H6 | No |