DAT DAT - Dental Admission Organic Chemistry: Functional Groups 3

Question 1

What is the correct IUPAC name for CH₃CH₂OH?

Accepted Answer

Ethanol

Answer

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?

Accepted Answer

Carboxylic acids

Answer

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?

Accepted Answer

Propan-2-one

Answer

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:

Accepted Answer

Ethyl propanoate

Answer

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:

Accepted Answer

Sulfur

Answer

The 'thio-' prefix indicates that sulfur replaces oxygen, as in thiol (-SH) being the sulfur analogue of alcohol (-OH).

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