Safety There are two compounds that you work with today that should be handled in the fume cupboard. One has a strong, sickly sweet, almond-like odour whilst the other is potentially carcinogenic. Identify them. Blank 1 Question 3[select: , 4-Chlorobenzaldehyde, Sodium hydroxide, Acetone, chloroform, cyclopentanone, ethanol] has a strong, sickly sweet, almond-like odour whilst Blank 2 Question 3[select: , 4-Chlorobenzaldehyde, Sodium hydroxide, Acetone, chloroform, cyclopentanone, ethanol] is potentially carcinogenic.

Question

BlackTom AI · Accepted Answer

Benzaldehyde derivatives (such as 4‑chlorobenzaldehyde) characteristically have a strong, sweet “almond‑like” odour, and chloroform is a volatile solvent classified as potentially carcinogenic and requiring fume-cupboard use.

1) Relevant knowledge points and concepts
- Aromatic aldehydes: Benzaldehyde and its substituted derivatives (e.g., 4‑chlorobenzaldehyde) are known for a characteristic bitter‑sweet, almond‑like smell. This is a chemical odor signature of the benzaldehyde functional group.  
- Volatile solvents and carcinogenicity: Chloroform (trichloromethane) is a volatile, halogenated solvent that is easily inhaled and is classified as a potential carcinogen (IARC classifies chloroform as possibly carcinogenic to humans), so it must be handled in a fume cupboard.

2) Step‑by‑step reasoning
- From the option list, identify which compound class is known for an almond odour: benzaldehyde derivatives. The only benzaldehyde derivative listed is 4‑chlorobenzaldehyde, so it matches the sensory description.  
- For the substance described as potentially carcinogenic, scan the list for known hazardous solvents: chloroform is well established as having carcinogenic potential and requiring fumehood handling.

3) Calculations/intermediate steps
- No numerical calculations are required; the determination is by matching known odor and hazard properties to the choices.

4) Why the correct answer is correct
- 4‑Chlorobenzaldehyde: substitution at the 4‑position does not remove the benzaldehyde character; it retains the almond‑like benzaldehyde odour.  
- Chloroform: widely documented as a volatile chlorinated solvent with evidence of carcinogenicity in animals and classified as potentially carcinogenic to humans, therefore it should be used in a fume cupboard.

5) Why the other options are incorrect
- Sodium hydroxide: a caustic base with no sweet almond odour; hazard is corrosivity, not carcinogenicity.  
- Acetone: a ketone with a sharp, fruity/solvent odour (nail‑polish remover), not almond‑like and not primarily classed as carcinogenic.  
- Cyclopentanone: a ketone with a ketonic/strong odour, not the characteristic benzaldehyde almond scent.  
- Ethanol: smells of alcohol, flammable but not classed as a potential carcinogen in the same context as chloroform.

6) Conclusion
Therefore the compound with the strong sickly sweet almond‑like odour is 4‑Chlorobenzaldehyde, and the potentially carcinogenic compound is chloroform — matching the provided answers.

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