--- title: "Functional Groups Worksheet with Answers – Free PDF" url: https://www.moldraw.com/educational-materials/functional-groups-identification-worksheet/ description: "Functional groups worksheet with answers: circle and name every functional group in aspirin, caffeine, penicillin, morphine, capsaicin and more. Free PDF." lang: en publisher: Scidart Academy generated: 2026-10-28 --- [MolDraw](https://www.moldraw.com/) › [Educational materials](https://www.moldraw.com/educational-materials/) › Functional Groups Identification Worksheet # Functional Groups Identification Worksheet Organic chemistryGrades 11–12 · A-level / IB · AP Chemistry · CBSE/JEE · Intro college organic12 items · answer key included Identifying functional groups is much more memorable when the molecules are real. This functional groups worksheet uses 12 well-known drugs and natural products — aspirin, paracetamol, ibuprofen, benzocaine, vanillin, adrenaline, caffeine, capsaicin, morphine, testosterone, penicillin G and oseltamivir (Tamiflu) — and asks students to circle and name every functional group. It covers alcohols and phenols, ethers, aldehydes, ketones, carboxylic acids, esters, amides, amines, alkenes, arenes and less common groups such as the β-lactam and thioether in penicillin. The answer key lists every group, making it ready-to-use identifying functional groups practice, homework or a printable PDF quiz. ## Customise Sheet title Subtitle School / teacher Student lines Name Class Date Answers None Answer key page Inline Text size S M L Structure size 100% Questions Circle and name every functional group Aspirin (pain relief) Paracetamol / acetaminophen Ibuprofen Benzocaine (local anaesthetic) Vanillin (vanilla flavour) Adrenaline / epinephrine Caffeine Capsaicin (chilli heat) Morphine Testosterone Penicillin G Oseltamivir (Tamiflu) Live A4 preview. “Download PDF” opens the print dialog: choose **Save as PDF**. Click a structure to open it in MolDraw. ## Functional Groups Identification Worksheet Name Class Date ## Circle and name every functional group Circle each functional group in the structure and write its name on the lines. Count benzene rings and C=C double bonds as well. 1. **Aspirin (pain relief)** ![Structure for the question](https://www.moldraw.com/educational-materials/img/functional-groups-identification-worksheet/s-06563901b1.svg) Carboxylic acid; ester (aryl ethanoate); benzene ring (arene). 2. **Paracetamol / acetaminophen** ![Structure for the question](https://www.moldraw.com/educational-materials/img/functional-groups-identification-worksheet/s-5b63f82289.svg) Phenol (–OH on the ring); secondary amide; benzene ring (arene). 3. **Ibuprofen** ![Structure for the question](https://www.moldraw.com/educational-materials/img/functional-groups-identification-worksheet/s-13989aaea3.svg) Carboxylic acid; benzene ring (arene). The rest is alkyl (alkane) chain. 4. **Benzocaine (local anaesthetic)** ![Structure for the question](https://www.moldraw.com/educational-materials/img/functional-groups-identification-worksheet/s-cd017aaf04.svg) Ester (ethyl ester); primary amine (aromatic amine / aniline –NH2); benzene ring (arene). 5. **Vanillin (vanilla flavour)** ![Structure for the question](https://www.moldraw.com/educational-materials/img/functional-groups-identification-worksheet/s-c41f3461c7.svg) Aldehyde (–CHO); ether (methoxy, –OCH3); phenol (–OH on the ring); benzene ring (arene). 6. **Adrenaline / epinephrine** ![Structure for the question](https://www.moldraw.com/educational-materials/img/functional-groups-identification-worksheet/s-4cfbb42d55.svg) Two phenol groups (a catechol); secondary alcohol; secondary amine (–NH–CH3); benzene ring (arene). 7. **Caffeine** ![Structure for the question](https://www.moldraw.com/educational-materials/img/functional-groups-identification-worksheet/s-6d3d2f1cda.svg) Two amide carbonyls (C=O next to ring N; one sits in a cyclic urea unit, N–CO–N); tertiary amine-type nitrogens (N–CH3); imine (C=N) in the five-membered ring; alkene (C=C). The fused ring system is a purine. 8. **Capsaicin (chilli heat)** ![Structure for the question](https://www.moldraw.com/educational-materials/img/functional-groups-identification-worksheet/s-f03aca38e1.svg) Phenol; ether (methoxy); secondary amide; alkene (trans/E C=C); benzene ring (arene). 9. **Morphine** ![Structure for the question](https://www.moldraw.com/educational-materials/img/functional-groups-identification-worksheet/s-7df043fc37.svg) Phenol; secondary alcohol; ether (cyclic, in the furan-type ring); tertiary amine (N–CH3); alkene (C=C); benzene ring (arene). 10. **Testosterone** ![Structure for the question](https://www.moldraw.com/educational-materials/img/functional-groups-identification-worksheet/s-1e9e6eb87a.svg) Ketone (conjugated with the C=C: an α,β-unsaturated ketone / enone); alkene (C=C); secondary alcohol. 11. **Penicillin G** ![Structure for the question](https://www.moldraw.com/educational-materials/img/functional-groups-identification-worksheet/s-f368928f23.svg) Carboxylic acid; β-lactam (cyclic amide in the four-membered ring); secondary amide (side chain); thioether / sulfide (C–S–C); benzene ring (arene). 12. **Oseltamivir (Tamiflu)** ![Structure for the question](https://www.moldraw.com/educational-materials/img/functional-groups-identification-worksheet/s-7da6bf18e8.svg) Ester (ethyl ester); alkene (C=C, conjugated with the ester); ether (pentan-3-yl ether); secondary amide (acetamido, –NHCOCH3); primary amine (–NH2). moldraw.com/educational-materials/functional-groups-identification-worksheet/ ## Answer key: Functional Groups Identification Worksheet ## Circle and name every functional group 1. Carboxylic acid; ester (aryl ethanoate); benzene ring (arene). 2. Phenol (–OH on the ring); secondary amide; benzene ring (arene). 3. Carboxylic acid; benzene ring (arene). The rest is alkyl (alkane) chain. 4. Ester (ethyl ester); primary amine (aromatic amine / aniline –NH2); benzene ring (arene). 5. Aldehyde (–CHO); ether (methoxy, –OCH3); phenol (–OH on the ring); benzene ring (arene). 6. Two phenol groups (a catechol); secondary alcohol; secondary amine (–NH–CH3); benzene ring (arene). 7. Two amide carbonyls (C=O next to ring N; one sits in a cyclic urea unit, N–CO–N); tertiary amine-type nitrogens (N–CH3); imine (C=N) in the five-membered ring; alkene (C=C). The fused ring system is a purine. 8. Phenol; ether (methoxy); secondary amide; alkene (trans/E C=C); benzene ring (arene). 9. Phenol; secondary alcohol; ether (cyclic, in the furan-type ring); tertiary amine (N–CH3); alkene (C=C); benzene ring (arene). 10. Ketone (conjugated with the C=C: an α,β-unsaturated ketone / enone); alkene (C=C); secondary alcohol. 11. Carboxylic acid; β-lactam (cyclic amide in the four-membered ring); secondary amide (side chain); thioether / sulfide (C–S–C); benzene ring (arene). 12. Ester (ethyl ester); alkene (C=C, conjugated with the ester); ether (pentan-3-yl ether); secondary amide (acetamido, –NHCOCH3); primary amine (–NH2). ## How to use this worksheet 1. Give students a functional-group reference table for the first attempt, then repeat the sheet later from memory. 2. Ask students to distinguish carefully: alcohol vs phenol, ester vs ether, amide vs amine, aldehyde vs ketone. 3. Decide in advance whether 'arene/benzene ring' and 'alkene' count as functional groups in your syllabus; the answer key lists them. 4. Extension: ask which groups make each drug more water-soluble (O–H, N–H, COOH) and which can be hydrolysed (esters, amides). 5. Set the title, student lines and answer option on the left, then press **Download PDF** and choose “Save as PDF” (or print directly). Your choices are remembered on this device. **Draw and edit structures in MolDraw.** Make your own questions: draw any molecule, then export it as PNG or SVG for your worksheets. [Draw and edit structures in MolDraw](https://www.moldraw.com/) ## Frequently asked questions ### What functional groups are in aspirin? Aspirin (acetylsalicylic acid) contains a carboxylic acid (–COOH), an ester (the ethanoate/acetate group attached to the ring oxygen) and a benzene ring. ### How do you tell an ester from an ether? An ether has an oxygen joined to two carbons by single bonds (C–O–C). An ester has that same C–O–C link but one of the carbons is also double-bonded to oxygen (C(=O)–O–C). ### What is the difference between an amine and an amide? In an amine the nitrogen is bonded only to carbon and/or hydrogen atoms. In an amide the nitrogen is bonded directly to a carbonyl carbon (C(=O)–N). Paracetamol contains an amide; benzocaine contains an amine. ### Is a phenol the same as an alcohol? No. A phenol has the –OH group attached directly to a benzene ring, whereas an alcohol has –OH on an sp3 carbon. Phenols are more acidic than alcohols. Vanillin and paracetamol contain phenols; testosterone contains an alcohol. ### Does this functional groups worksheet have answers? Yes. 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