DAT DAT - Dental Admission Organic Chemistry: Functional Groups 3 — Questions and Answers
Question 1: What is the correct IUPAC name for CH₃CH₂OH?
- Methanol
- Ethanol (Correct answer)
- Propanol
- Butanol
Correct answer: Ethanol
CH₃CH₂OH has a two-carbon chain with a hydroxyl group; its IUPAC name is ethan-1-ol (ethanol).
Question 2: The IUPAC suffix '-oic acid' designates which functional group class?
- Alcohols
- Aldehydes
- Carboxylic acids (Correct answer)
- Ketones
Correct answer: Carboxylic acids
The '-oic acid' suffix indicates a carboxylic acid in IUPAC nomenclature (e.g., ethanoic acid = acetic acid).
Question 3: The compound CH₃COCH₃ has which IUPAC name?
- Propanoic acid
- Propan-1-ol
- Propan-2-one (Correct answer)
- Propanal
Correct answer: Propan-2-one
CH₃COCH₃ (acetone) has three carbons with a central ketone carbonyl; its IUPAC name is propan-2-one.
Question 4: The ester formed from ethanol and propanoic acid is named:
- Ethyl acetate
- Ethyl propanoate (Correct answer)
- Propyl ethanoate
- Propyl acetate
Correct answer: Ethyl propanoate
Esters are named as [alkyl group from alcohol]-[carboxylate from acid]; ethanol + propanoic acid gives ethyl propanoate.
Question 5: The prefix 'thio-' in organic nomenclature indicates replacement of oxygen with:
- Nitrogen
- Phosphorus
- Sulfur (Correct answer)
- A halogen
Correct answer: Sulfur
The 'thio-' prefix indicates that sulfur replaces oxygen, as in thiol (-SH) being the sulfur analogue of alcohol (-OH).
Question 6: What is the correct IUPAC name for CH₃CH₂CHO?
- Propanal (Correct answer)
- Propanone
- Propanoic acid
- Propan-1-ol
Correct answer: Propanal
CH₃CH₂CHO has three carbons with a terminal aldehyde group, giving it the IUPAC name propanal.
DAT DAT - Dental Admission Organic Chemistry: Functional Groups 3
What is the correct IUPAC name for CH₃CH₂OH?