Fundamental Principles of Organic Chemistry

Fundamental Principles of Organic Chemistry MDCAT MCQs with answers

41 past paper MCQs from Chemistry unit 13, Fundamental Principles of Organic Chemistry, across 3 topics. They are arranged topic by topic; bigger topics show a sample here and link to their full set and to study notes. Tap “Show answer” for the correct option and a short solution.

Practise as a quiz

Classification of Organic Compounds

1.What is the molecular formula of the pyridine molecule? (MDCAT 2023)

  1. $\mathrm{C_6H_5N}$
  2. $\mathrm{C_5H_5N}$
  3. $\mathrm{C_4H_4N}$
  4. $\mathrm{C_6H_6N}$
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Correct answer: (b) $\mathrm{C_5H_5N}$

Pyridine is benzene with one CH replaced by N, so it is $\mathrm{C_5H_5N}$.

2.Homocyclic organic compounds are subdivided into two types, namely: (MDCAT 2024)

  1. alicyclic and aromatic
  2. alkenes and alkynes
  3. aromatic and non-aromatic
  4. saturated and unsaturated
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Correct answer: (a) alicyclic and aromatic

Rings of carbon only are either alicyclic, like cyclohexane, or aromatic, like benzene.

3.Pyridine belongs to which class of organic compounds? (KMU MDCAT 2024)

  1. Alicyclic
  2. Heterocyclic
  3. Homocyclic
  4. Hydrocarbon
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Correct answer: (b) Heterocyclic

Pyridine has a nitrogen atom in its ring, so it is heterocyclic.

All 16 Classification of Organic Compounds MCQs → Classification of Organic Compounds notes →

Functional Groups

4.The compounds containing the $\mathrm{R-SH}$ functional group are known as: (MDCAT 2022)

  1. alcohols
  2. thio-alcohols
  3. thio-ethers
  4. nitriles
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Correct answer: (b) thio-alcohols

Sulphur in the place of the oxygen of an alcohol gives a thio-alcohol, or thiol.

5.CnH2nO is the general formula of: (UHS MDCAT 2024)

  1. Ether
  2. Carboxylic acid
  3. Ketones
  4. Carbolic acid
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Correct answer: (c) Ketones

A ketone of formula $\mathrm{C_nH_{2n}O}$ carries one carbonyl group inside the chain.

6.Name of ketone functional group is (KMU MDCAT 2024)

  1. Amino
  2. Carbonyl
  3. Carboxyl
  4. Formyl
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Correct answer: (b) Carbonyl

The group in a ketone is the carbonyl group.

All 7 Functional Groups MCQs → Functional Groups notes →

Isomerism

7.What are vinyl alcohol and acetaldehyde? (MDCAT 2023)

  1. position isomers
  2. chain isomers
  3. metamers
  4. tautomers
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Correct answer: (d) tautomers

They differ by the place of a hydrogen and a double bond and interconvert, which makes them tautomers.

8.1-Butene and 2-butene show which type of isomerism? (MDCAT 2024)

  1. functional group
  2. position
  3. metamerism
  4. chain
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Correct answer: (b) position

The chain and the functional group are the same in both; only the position of the double bond differs.

9.Which type of isomerism is displayed by compounds having the same structural formula but a different position of atoms on the two sides of a carbon-carbon double bond? (MDCAT 2024)

  1. chain
  2. metamerism
  3. geometric
  4. tautomerism
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Correct answer: (c) geometric

Restricted rotation about the double bond gives the cis and trans forms, which is geometric isomerism.

All 18 Isomerism MCQs → Isomerism notes →

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