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.多重下拉选择题
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Question

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.多重下拉选择题

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BlackTom AI · Accepted Answer

Benzaldehyde-type compounds are known for an almond-like odour, and trihalomethanes such as chloroform are classed as potentially carcinogenic, so the correct pair is 4‑Chlorobenzaldehyde and chloroform.

1. Relevant knowledge points and concepts
- Aromatic aldehydes (benzaldehyde and its derivatives) characteristically have a bitter-sweet, almond-like smell. Substitution on the aromatic ring (e.g., 4‑chloro) typically retains that odour character.  
- Chloroform (trichloromethane) is volatile, centrally acting and has been classified by agencies (IARC) as “possibly carcinogenic to humans” (Group 2B), so it requires handling in a fume cupboard.  
- Other listed chemicals either have distinctly different odours or different hazard profiles (caustic, flammable, ketone smell, etc.).

2. Step-by-step reasoning
- Inspect the list for compounds with an aldehyde/benzaldehyde structure: 4‑Chlorobenzaldehyde is the only benzaldehyde derivative listed → this matches the almond-like, sickly-sweet odour description.  
- Inspect the list for a compound with a known carcinogenic or potentially carcinogenic classification: chloroform is historically and currently flagged as potentially carcinogenic and is volatile/toxic → this matches the second description.  
- Confirm both require fume-cupboard use: 4‑Chlorobenzaldehyde (volatile organic aromatic aldehyde with irritating vapours) and chloroform (toxic, possible carcinogen) both warrant fume-hood handling.

3. Intermediate “calculations” / checks
- Odour match check: benzaldehyde core → almond-like aroma → 4‑Chlorobenzaldehyde fits.  
- Hazard classification check: chloroform → IARC Group 2B (possible carcinogen) and known inhalation risks → fits “potentially carcinogenic.”

4. Why the correct answer is correct
- 4‑Chlorobenzaldehyde: retains the benzaldehyde functional group responsible for the characteristic almond-like smell.  
- Chloroform: documented as potentially carcinogenic and sufficiently hazardous to require containment and fume-cupboard use.

5. Why other options are incorrect (brief)
- Sodium hydroxide: corrosive (caustic), not almond-smelling and not a carcinogen.  
- Acetone: sweet, solvent-like/fruity odor (not almond) and flammable but not classed as a carcinogen.  
- Cyclopentanone: ketone odor (not almond-like) and not classed as a known carcinogen.  
- Ethanol: recognizable alcoholic smell, flammable, not classed as a carcinogen in typical lab exposures.

6. Conclusion
The compound with the strong, sickly sweet, almond-like odour is 4‑Chlorobenzaldehyde, and the compound that is potentially carcinogenic is chloroform. This matches the provided answer: 4‑Chlorobenzaldehyde and chloroform.

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