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.
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Read the Alkyl Halides notesFree MDCAT chapter notes with key terms458 questions · page 18 of 23
- A. Leaving group
- B. Electrophile
- C. Substrate
- D. Weak nucleophile
Explanation: The group that leaves from the substrate in a nucleophilic substitution reaction is called the leaving group.
Correct answer: Leaving group- A. Water
- B. Ammonia
- C. Carbon tetrachloride
- D. Acetic acid
Explanation: Carbon tetrachloride is a nonpolar solvent. SN2 reactions are favored in nonpolar solvents because these solvents do not solvate ions as…
Correct answer: Carbon tetrachloride- A. Secondary carbocation
- B. Primary carbocation
- C. Tertiary carbocation
- D. Methyl carbocation
Explanation: In SN1 reactions, the carbocation formed is stabilized by adjacent alkyl groups.
Correct answer: Tertiary carbocation- A. Water
- B. Benzene
- C. Carbon tetrachloride
- D. Carbon disulphide
Explanation: Water is a polar protic solvent. In SN1 reactions, the nucleophile is not involved in the rate-determining step, and a polar protic…
Correct answer: Water- A. Concentration of nucleophile is doubled
- B. Concentration of substrate is doubled
- C. Concentration of substrate is tripled
- D. Concentration of substrate remains same
Explanation: The correct option is B. The rate of SN1 (Substitution Nucleophilic Unimolecular) reactions depends on the concentration of the substrate.
Correct answer: Concentration of substrate is doubled- A. Alkanes
- B. Alcohols
- C. Carboxylic acids
- D. All of these
Explanation: Option D, "All of these," is correct. Grignard reagents can be used for the preparation of alkanes, alcohols, and carboxylic acids through…
Correct answer: All of these- A. Reaction of alcohol with HX
- B. Reaction of alcohol with SOCl2
- C. Reaction of Alcohol with PCl3
- D. Reaction of Alcohol with PCI5
Explanation: Option B is the best method to prepare alkyl halides from alcohols because it involves the reaction of alcohol with thionyl chloride…
Correct answer: Reaction of alcohol with SOCl2- A. Phenol
- B. Ethanol
- C. Carboxylic acid
- D. NaOH
Explanation: B. Ethanol is correct because it is neutral to litmus. Litmus is a natural dye that changes color in response to acidic or basic…
Correct answer: Ethanol- A. Alkyl halogens
- B. Halogenoparaffins
- C. Haloalkanes
- D. Alkyl halides
Explanation: In IUPAC nomenclature, alkyl halides are named as Haloalkanes. This is because the naming convention follows the order of the…
Correct answer: Haloalkanes- A. Transition state
- B. Intermediate
- C. Carbanion
- D. Carbocation
Explanation: In SN1 reactions, the rate-determining step involves the formation of a carbocation intermediate.
Correct answer: Carbocation- A. SN2
- B. E1
- C. SN1
- D. E2
Explanation: In a solution of alkyl halide in a nonpolar solvent with a base added, the reaction that is likely to take place is D.
Correct answer: E2- A. Ammonia
- B. Water
- C. Methanol
- D. All of these
Explanation: Gignard reagents, represented as RMgX, are highly reactive organometallic compounds.
Correct answer: All of these353. Which one of the following reactions is used to produce symmetrical alkanes from alkyl halides?
- A. Wurtz-Fittig reaction
- B. Kolbe's electrolysis
- C. Reduction of alkyl halide
- D. Wurtz reaction
Explanation: The correct answer is D (Wurtz reaction). The Wurtz reaction is commonly used to produce symmetrical alkanes from alkyl halides.
Correct answer: Wurtz reaction- A. 2 and 1
- B. 2 and 2
- C. 1 and 1
- D. 1 and 2
Explanation: For SN2 reactions: Molecularity is second-order (bimolecular) because the reaction involves a collision between a substrate molecule and a…
Correct answer: 2 and 2- A. RCH2X
- B. R2CHX
- C. RX
- D. R3CX
Explanation: The secondary alkyl halide is represented by option B (R2CHX). This is because it has two alkyl (R) groups attached to the carbon atom…
Correct answer: R2CHX- A. CH3―CH2―NH―CH2―CH3
- B. CH3―CH2―NH2
- C. CH3―CH2―CH2―NH2
- D. H2N―CH2―CH2―NH2
Explanation: With bromoethane and ammonia, ethyl ammonium bromide is formed as shown below:
Correct answer: CH3―CH2―NH2- A. has
- B. have
- C. had
- D. will have left
Explanation: The correct answer is have, as it is the plural form of the verb "have" that agrees with the plural subject "Both of my roommates." This…
Correct answer: have- A. Accolade
- B. Apathy
- C. Caricature
- D. Attire
Explanation: "Caricature" is correct because it specifically refers to a picture or representation that exaggerates certain features, usually for comic…
Correct answer: Caricature- A. itself
- B. advice
- C. on
- D. themselves
Explanation: The error in the sentence is in option (A) "itself," which should be replaced with "themselves" to correctly reflect the plural nature of…
Correct answer: itself- A. Definitely true
- B. Probably true
- C. Data inadequate
- D. Probably false
- E. Definitely false
Explanation: "Human beings are the natural prey of tigers" is definitely false.
Correct answer: Definitely false