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 8 of 23
- A. 2, 1
- B. 1, 1
- C. 0, 1
- D. 0, 2
Explanation: The molecularity refers to the number of species that are undergoing bond-breaking or making in one step of the reaction, usually, in the…
Correct answer: 1, 1- A. Transition state
- B. Intermediate
- C. Carbocation
- D. Carbene
Explanation: SN1 reaction mechanism follows a step-by-step process where in first, the carbocation is formed from the removal of the leaving group.
Correct answer: Carbocation143. The compounds which are formed by the replacement of a hydrogen atom by a halogen are called as _?
- A. Alcohol
- B. Alkyl halide
- C. Carbonyl halide
- D. Ethers
Explanation: Alkyl halides are also known as halogenoalkanes are formed when a hydrogen atom is removed from an alkene/alkane are known as alkyl…
Correct answer: Alkyl halide- A. Wittig reaction
- B. Kolbe's electrolysis
- C. Reduction of alkyl halide
- D. Wurtz reaction
Explanation: Wurtz reaction is the one in which longer chain alkanes are made from two different alkyl halides coupling together with the help of…
Correct answer: Wurtz reaction- A. SN2
- B. E2
- C. SN1
- D. None of these
Explanation: The SN1 mechanism is a two-stepmechanism in which the rate is dependent on the halogenoalkane and not the nucleophile.
Correct answer: SN1- A. Ionization
- B. Formation of carbocation
- C. Formation of Double bond
- D. Formation of alkyl halide from carbocation
Explanation: The formation of a carbocation is the slow, or rate-determining, step. The subsequent step, formation of a bond between the nucleophile…
Correct answer: Formation of carbocation- A. CH3CH2CH2CH2OH
- B. CH3CH2CH2OH
- C. CH3CH2COOH
- D. CH3CH2CH2Br
Explanation: Grignard reagents will add to carbon dioxide, forming carboxylate salts. After acidic work-up, carboxylic acids are formed.
Correct answer: CH3CH2COOH- A. Electrophile
- B. Nucleophile
- C. Leaving group
- D. Both nucleophile and leaving group
Explanation: A nucleophile is a specie with a negative charge and a specie that belongs to a leaving group is one that can break away from a molecule…
Correct answer: Both nucleophile and leaving group- A. 2-chloropropane
- B. 1-chlorobutane
- C. 2-butene
- D. 4-chlorohexane
Explanation: Monohaloalkanes are usually called alkyl halides. The functional group of alkyl halides is halogen.
Correct answer: 2-butene- A. Water
- B. Ammonia
- C. Carbon tetrachloride
- D. Acetic acid
Explanation: OPTIONS A, B, and D:Polar Protic solvents are polar solvents that have at least 1 hydrogen that is connected directly to a particular…
Correct answer: Carbon tetrachloride- A. CH3-CH2-CH(Cl)-CH-CH3
- B. CH3-CH2-CH(CH3)-CH(Cl)-CH3
- C. CH3-CH2-CH(Cl)-CH(Cl)-CH3
- D. CH3-CH2-CH(Cl)-CH(CH3)-CH3
Explanation: Number the chain from the end closer to the halogen atom. The substituents should be in alphabetical order. Hence, B is the correct option.
Correct answer: CH3-CH2-CH(CH3)-CH(Cl)-CH3- A. Acetaldehyde
- B. Epoxide
- C. Acetone
- D. Carbon dioxide
Explanation: Option A : Acetaldehyde with Grignard reagents produces secondary alcohol.
Correct answer: Epoxide- A. Presence of Mg atom
- B. Polarity of C-H bond
- C. Polarity of C-Mg bond
- D. Presence of electrophilic carbon
Explanation: Option A is incorrect because only the presence of the Mg atom doesn't make Grignard reagent reactive.
Correct answer: Polarity of C-Mg bond- A. Carboxylic Acid
- B. Alcohol
- C. Aldehyde
- D. Ketone
Explanation: Option A: The hydrolysis of tertiary butyl bromide (t-butyl bromide) does not give carboxylic acid.
Correct answer: Alcohol- A. Secondary carbocation
- B. Primary carbocation
- C. Tertiary carbocation
- D. Methyl carbocation
Explanation: In step 1 of the SN1 reaction mechanism, the C-Br bond breaks and Br departs with the bonding electron pair to produce a tertiary…
Correct answer: Tertiary carbocation- A. Sp2 to sp3
- B. Sp to sp2
- C. Sp3 to sp2
- D. Sp to sp3
Explanation: The substrate present in SN2 reactions is sp3 hybridized. In transition state of SN2 mechanism, the carbon atom is sp2 hybridised due to…
Correct answer: Sp3 to sp2- A. (C2H5)4Pb
- B. (CH3)4Pb
- C. (CH4)4Pb
- D. (CH2)4Pd
Explanation: The methyl group is represented by '-CH3'. The name of the compound, given in the question, highlights 4 methyl groups, thus (CH3)4 and a…
Correct answer: (CH3)4Pb- A. E1, SN2
- B. E2 , SN1
- C. E2 , SN2
- D. E1 , SN1
Explanation: Both, SN1 and E1 reactions are two stepped reactions, with the first step involving the formation of a carbocation, formed from the…
Correct answer: E1 , SN1- A. Secondary propyl chloride
- B. Tertiary butyl chloride
- C. Secondary butyl chloride
- D. lsobutyl Chloride
Explanation: The carbon bonded to chlorine is bonded to three more carbons.
Correct answer: Tertiary butyl chloride- A. Water
- B. Benzene
- C. Carbon Tetrachloride
- D. Carbon Disulphide
Explanation: SN1 reactions are favored by polar protic solvents (H2O, ROH, etc.).
Correct answer: Water