7 past paper MCQs on Functional Groups, from the Fundamental Principles of Organic Chemistry unit of MDCAT Chemistry. The year each question appeared is shown where known; tap “Show answer” for the correct option and a short solution.
1.The compounds containing the $\mathrm{R-SH}$ functional group are known as: (MDCAT 2022)
Correct answer: (b) thio-alcohols
Sulphur in the place of the oxygen of an alcohol gives a thio-alcohol, or thiol.
2.CnH2nO is the general formula of: (UHS MDCAT 2024)
Correct answer: (c) Ketones
A ketone of formula $\mathrm{C_nH_{2n}O}$ carries one carbonyl group inside the chain.
3.Name of ketone functional group is (KMU MDCAT 2024)
Correct answer: (b) Carbonyl
The group in a ketone is the carbonyl group.
4.In which of the following functional groups, the carbon atom is sp hybridized? (UHS MDCAT 2023)
Correct answer: (c) -CN
The carbon of a nitrile is triply bonded to nitrogen, so it is sp hybridized.
5.The compounds containing R-SH functional group are known as: (UHS MDCAT 2023)
Correct answer: (b) Thio-alcohols
Replacing the oxygen of an alcohol with sulphur gives a thio-alcohol, or thiol.
6.Which of the functional group are present in ethyl acetate? (UHS MDCAT 2023)
Correct answer: (c) Ester group
Ethyl acetate is the ester of acetic acid and ethanol.
7.Which of the following is an oxonium ion? (PMC MDCAT 2022)
Correct answer: (d) H3O+
The hydronium ion is an oxonium ion, oxygen with three bonds and a positive charge.