MDCAT Alkyl Halides MCQs
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3
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224
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Sample Alkyl Halides MCQs with answers
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RX Nomenclature
1. In a reaction having both alkyl halide and base, the base will attack on the _________.
- A. Electrophilic carbon
- B. Nucleophilic carbon
- C. Beta-hydrogen
- D. None of these options is correct
View answer and explanation
Answer: C. Beta-hydrogen
When both substitution and elimination are possible, a base abstracts a beta-hydrogen to form the alkene ( elimination). Attack at carbon gives substitution instead. Hence the base attacks the beta-hydrogen.
Elimination Reactions
2. What is the expected major alkene when (CH3)3CCl is heated with alcoholic KOH?
- A. propene
- B. 2-methylbut-2-ene
- C. 2-methylbut-1-ene
- D. 2-methylpropene
View answer and explanation
Answer: D. 2-methylpropene
Dehydrohalogenation removes H and halogen from adjacent carbons; the principal alkene is 2-methylpropene.
Nucleophilic Substitution
3. Which of the following compounds can be prepared by using Grignard reagent?
- A. Alkanes
- B. Alcohols
- C. Carboxylic acids
- D. All of these
View answer and explanation
Answer: D. All of these
Keyword/Clue: prepared by using Grignard reagent Concept/Formula: Grignard reagents (RMgX) act as strong nucleophiles/bases and can form multiple functional groups depending on the electrophile and workup: (i) alkanes by protonation (RMgX + H2O/ROH \→ RH), (ii) alcohols by addition to aldehydes/ketones/esters followed by hydrolysis, and (iii) carboxylic acids by reaction with CO2 followed by acidic workup (RMgX + CO2 \→ RCOO^-MgX^+; then H3O^+ \→ RCOOH). Why the Other Options Are Wrong: - Option A: Incorrect as a single best choice because Grignard reagents make more than just alkanes. - Option B: Incorrect as a single best choice because Grignard reagents make more than just alcohols. - Option C: Incorrect as a single best choice because Grignard reagents make more than just carboxylic acids.
About this unit
MDCAT Alkyl Halides — Unit 31
544 practice MCQs covering RX Nomenclature, Nucleophilic Substitution, Elimination Reactions. Select custom topics and sit tailored tests up to 180 questions per drill.
Common questions about Alkyl Halides practice
How many Alkyl Halides MCQs are available on DIFF. MDCAT?
The current Alkyl Halides question bank contains 544 practice MCQs across 3 topics. This is the bank size, not the length of one test. Choose your topics and a question count from 1 to 180, limited by the questions available in those topics.
Which topics does the Alkyl Halides quiz cover?
The selectable topics are RX Nomenclature, Nucleophilic Substitution, Elimination Reactions. Use Select all for a broad chapter drill, Clear to start a focused selection, or choose individual topics. Questions are drawn from your chosen topics, so you can target a weak concept before returning to a wider test.
How do I build a custom Alkyl Halides test?
Open the chapter builder, select one or more topics, enter your question count, and choose Tutor Mode or Timed Exam. The available-question total updates with your selection. Start Test generates a shuffled drill; you do not have to follow a fixed Quiz 1 or Quiz 2 sequence.
What is the difference between Tutor Mode and Timed Exam?
Tutor Mode gives feedback and an explanation after you choose an option, and you can change or clear that choice. Timed Exam runs a countdown and keeps explanations hidden until submission. Both modes let you move between questions, use the paper map, and submit for a complete review.
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Select Submit Quiz, then Submit & View Explanations. The review includes every question in your test, all options, your selection, the marked correct answer when a key is available, and the explanation. Download PDF saves a paginated review; Download Review saves an HTML copy you can open in a browser. The review also includes DIFF. MDCAT community links.
How should I use Alkyl Halides MCQs to improve?
Start with a short tutor drill on one of these topics: RX Nomenclature, Nucleophilic Substitution, Elimination Reactions. Read the explanation for incorrect and uncertain answers, revise the relevant textbook section, and retry before taking a timed drill. Compare your reasoning with the answer key rather than memorising the option letter.