Free Alkyl Halides MCQs with Answers
458 Alkyl Halides MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Alkyl halides are named and related to their carbon-halogen structure, polarity and reactivity. The key reactions are nucleophilic substitution by SN1 and SN2 mechanisms and elimination by E1 and E2 mechanisms, including how substrate structure, nucleophile, base, solvent and temperature influence substitution versus elimination.
Last updated
Read the Alkyl Halides notesFree MDCAT chapter notes with key terms458 questions · page 11 of 23
- A. NH3+
- B. COO_
- C. H+
- D. R group
Explanation: If you decrease the pH by adding an acid to a solution of an amino acid, the -COO- part of the zwitter ion picks up a hydrogen ion…
Correct answer: COO_- A. Ethoxide ion
- B. Alkyl halide
- C. Alkene
- D. Carbocation
Explanation: The product of step 1, carbocation, will be the reactant of the next step and is called the intermediate for the SN1 reaction.
Correct answer: Carbocation- A. Primary alkyl halides
- B. Secondary alkyl halides
- C. Tertiary alkyl halides
- D. Both secondary and tertiary alkyl halides
Explanation: Since primary alkyl halide is least sterically hindered among primary, secondary and tertiary alkyl halides therefore primary alkyl…
Correct answer: Primary alkyl halides- A. Acidic K2Cr2O7
- B. CuCl
- C. Acidic NaOH
- D. Alcoholic KOH
Explanation: The reagent used in the Elimination reaction (𝛃 - elimination) in case of alkyl halides is alcoholic KOH.
Correct answer: Alcoholic KOH- A. CH3 − CH2 − Cl
- B. CH3 − CH2 − Br
- C. CH3 − CH2 − F
- D. CH3 − CH2 − I
Explanation: Iodide ion is a very good leaving group due to low bond energy so the attack of KOH(aq) to proceed SN reaction and hence it can be easily…
Correct answer: CH3 − CH2 − I- A. C𝐻3 − 𝐶𝐻 = 𝐶𝐻 − 𝐶H3
- B. C𝐻3 − 𝐶(𝐶𝐻3) = 𝐶𝐻 − 𝐶𝐻3
- C. C2𝐻5 − 𝐶𝐻 = 𝐶𝐻 − 𝐶𝐻3
- D. C𝐻3 − 𝐶𝐻 = 𝐶𝐻 − 𝐶3𝐻7
Explanation: Markovnikov Rule predicts the regiochemistry of HX addition to unsymmetrically substituted alkenes.
Correct answer: C𝐻3 − 𝐶(𝐶𝐻3) = 𝐶𝐻 − 𝐶𝐻3- A. Electrophile
- B. Lewis acid
- C. Electron deficient specie
- D. Bear all properties
Explanation: The function of AlCl3(anhydrous), in the Friedel-Craft reaction, is to produce electrophile, which later adds to the benzene nucleus.
Correct answer: Bear all properties208. 𝑂𝐻− + 𝐶2𝐻5 − 𝐼 ⟶ 𝐶2𝐻5 − 𝑂𝐻 + 𝐼− One of the species in the above reaction is a substrate. It is:
- A. 𝑂𝐻−
- B. 𝐶𝐻3 − 𝐶𝐻2 − 𝑂H
- C. 𝐼−
- D. C𝐻3 − 𝐶𝐻2 − I
Explanation: The molecule which contains the electrophile and the leaving functional group is called a substrate.
Correct answer: C𝐻3 − 𝐶𝐻2 − I- A. Diethyl methyl amine
- B. Dimethyl amine
- C. Methyl propyl amine
- D. Butyl amine
Explanation: The greater the basicity of amines the higher its reactivity. Order of basicity if the −R group is −CH3 group: Secondary amine > primary…
Correct answer: Dimethyl amine- A. Increases
- B. Decreases
- C. Not dependent
- D. Depends upon pressure
Explanation: As the polarizing power of the cation increases, it polarizes the carbonate (anion).
Correct answer: Decreases- A. C2H5O
- B. C2H5S
- C. Both are equally strong
- D. None of the above
Explanation: C2H5S- is the stronger nucleophile due to the positive inductive effect from the alkyl group and since sulfur has more electrons than…
Correct answer: C2H5S- A. Secondary amines
- B. Tertiary amines
- C. Quatemary amines
- D. All are insoluble
Explanation: Lower amines can form hydrogen bonds with water thus making them more soluble.
Correct answer: Secondary amines- A. Nucleophile
- B. Lewis base
- C. Ligand
- D. All of the above
Explanation: A nucleophile is a molecule or substance that tends to donate electrons or react at electron-poor sites such as protons.
Correct answer: Nucleophile- A. Schiff's salt
- B. Diazonium salt
- C. Amide
- D. Imine
Explanation: Based on the given reaction, the product formed is likely an imine, specifically an N-ethyl-N-(2-phenylethyl)imine.
Correct answer: Imine- A. Ammonia
- B. Urea
- C. Di-ammonium hydrogen phosphate
- D. Ammonium nitrate
Explanation: Urea has the highest nitrogen content of all solid fertilizers at 46% Nitrogen.
Correct answer: Urea- A. Methyl chloride
- B. Methylene chloride
- C. Chloroform
- D. Carbonyl chloride
Explanation: Methylene chloride, also called dichloromethane, is a volatile, colorless liquid with a chloroform-like odor.
Correct answer: Methylene chloride- A. Primary Alkyl Halides
- B. Secondary Alkyl Halides
- C. Tertiary Alkyl Halides
- D. Quarternary Alkyl Halides
Explanation: 2-cholorobutane is attached to the carbon that is attached to 2 other carbons hence it is a secondary alkyl halide.
Correct answer: Secondary Alkyl Halides- A. NH3
- B. HO
- C. HC = CH
- D. Br2
Explanation: The electron rich part of the double bond causes a dipole to form meaning that bromine becomes electron deficient and therefore becomes…
Correct answer: Br2- A. 5% methyl alcohol ... negative
- B. 2% Ethyl alcohol ... negative
- C. V2O5 ... positive
- D. Al2O3 ..... negative
Explanation: The catalyst in the above reaction is 2% ethyl alcohol with a negative nature.
Correct answer: 2% Ethyl alcohol ... negative- A. Secondary alkyl halides
- B. Tertiary alkyl halides
- C. Vinyl halides
- D. Primary alkyl halides
Explanation: The SN2 (Substitution Nucleophilic Bimolecular) mechanism typically occurs with primary (1°) alkyl halides.
Correct answer: Primary alkyl halides