MDCAT Chemistry — Alkyl Halides
Alkyl Halides is a core Chemistry topic in the PMDC MDCAT syllabus, covering 4 subtopics. Below are the subtopics to revise, how often the topic appears in past papers, and real past-paper MCQs to try.
Subtopics (4)
- Elimination Mechanisms
- Grignard Reagents
- Nomenclature, Structure, Reactivity
- Nucleophilic Substitution Mechanisms
How Alkyl Halides is tested
Across the 16 MDCAT past papers on ParhaiKrlo, Alkyl Halides accounts for 28 questions. It appears in 13 of them, about 2.2 questions a paper. The heaviest was MDCAT 2022, with 3 questions, and the most recent is MDCAT 2025, with 1.
| Paper | Questions |
|---|---|
| MDCAT 2025 | 1 |
| MDCAT 2024 | 2 |
| MDCAT 2023 | 2 |
| MDCAT 2022 | 3 |
| MDCAT 2019 | 2 |
| MDCAT 2018 | 2 |
| MDCAT 2016 | 1 |
| MDCAT 2014 | 2 |
| MDCAT 2013 | 3 |
| MDCAT 2012 | 2 |
| MDCAT 2011 | 3 |
| MDCAT 2010 | 2 |
| MDCAT 2009 | 3 |
Alkyl Halides MCQs from the MDCAT past papers
Try each one before opening the answer. Each comes with a short explanation.
- Q1 · MDCAT 2025 · Alkyl Halides
IUPAC name of (CH₃)₃CCH₂Br is:
- A.1-bromopentane
- B.1-bromo-2,2,2-trimethylethane
- C.1-bromo-2,2-dimethylpropane
- D.2-bromopentane
Show answer
Answer: C. 1-bromo-2,2-dimethylpropane — (CH3)3CCH2Br is named 1-bromo-2,2-dimethylpropane.
- Q2 · MDCAT 2024 · Alkyl Halides
Identify correct ascending order of reactivity of alkyl halides:
- A.Cl, Br, I, F
- B.F, Cl, Br, I
- C.Br, I, F, Cl
- D.I, F, Cr, Br
Show answer
Answer: B. F, Cl, Br, I — Alkyl halide reactivity increases in the order F < Cl < Br < I.
- Q3 · MDCAT 2023 · Alkyl Halides
In SN₁ reactions the correct order of reactivity of alkyl halide is:
- A.Primary > secondary > tertiary
- B.Tertiary > secondary > primary
- C.Secondary > primary > tertiary
- D.Primary > tertiary > secondary
Show answer
Answer: B. Tertiary > secondary > primary — In SN1 reactions, reactivity follows tertiary > secondary > primary alkyl halides.